Solve the Linear Equation: 2x⋅4-1+x+2=19 Step-by-Step

Linear Equations with Multiple Operations

2x41+x+2=19 2x\cdot4-1+x+2=19

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's solve each multiplication separately
00:10 Let's collect like terms
00:17 We want to isolate the unknown X
00:20 Let's arrange the equation so that one side has only the unknown X
00:36 Let's isolate the unknown X and calculate
00:45 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

2x41+x+2=19 2x\cdot4-1+x+2=19

2

Step-by-step solution

To solve the problem, we'll follow these steps:

  • Step 1: Eliminate multiplication by distributing 2x4 2x \cdot 4 .
  • Step 2: Combine like terms on the left side of the equation.
  • Step 3: Isolate the variable x x by moving constants to the opposite side.

Let's work through these steps:

Step 1: The given equation is 2x41+x+2=19 2x \cdot 4 - 1 + x + 2 = 19 .
Distribute the multiplication on 2x4 2x \cdot 4 to get 8x 8x :

8x1+x+2=19 8x - 1 + x + 2 = 19

Step 2: Combine the like terms (8x 8x and x x ):

9x1+2=19 9x - 1 + 2 = 19

Simplify further by combining constants 1+2-1 + 2 to get:

9x+1=19 9x + 1 = 19

Step 3: Isolate x x by subtracting 1 from both sides:

9x=18 9x = 18

Finally, divide both sides by 9 to solve for x x :

x=189=2 x = \frac{18}{9} = 2

Therefore, the solution to the problem is x=2 x = 2 .

3

Final Answer

x=2 x=2

Key Points to Remember

Essential concepts to master this topic
  • Order of Operations: Multiply first, then combine like terms systematically
  • Technique: Calculate 2x4=8x 2x \cdot 4 = 8x , then group 8x+x=9x 8x + x = 9x
  • Check: Substitute x=2 x = 2 : 2(2)41+2+2=19 2(2) \cdot 4 - 1 + 2 + 2 = 19

Common Mistakes

Avoid these frequent errors
  • Forgetting to multiply 2x by 4 correctly
    Don't leave it as 2x⋅4 - 1 + x + 2 = 6x + 1 = 19! This gives x = 3, which is wrong. Always multiply coefficients first: 2x⋅4 = 8x, then combine with x to get 9x.

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( x - 3 + 5 = 8 - 2 \)

FAQ

Everything you need to know about this question

Why do I multiply 2x by 4 first?

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The order of operations says multiplication comes before addition! So 2x4 2x \cdot 4 must be calculated as 8x 8x before combining with other terms.

How do I combine 8x and x?

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Since both terms have the same variable x x , add their coefficients: 8x+1x=9x 8x + 1x = 9x . Think of it like 8 apples + 1 apple = 9 apples!

What if I get a different answer when checking?

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If substituting your answer doesn't work, go back and check each step. Most errors happen when multiplying or combining like terms. Redo the calculation carefully!

Can I solve this equation differently?

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You could rearrange terms first, but it's easier to follow order of operations: multiply first, then combine like terms, then isolate the variable. This prevents confusion!

Why is the answer x = 2 and not x = 18?

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After combining terms, we get 9x+1=19 9x + 1 = 19 , so 9x=18 9x = 18 . Dividing both sides by 9 gives x=2 x = 2 , not 18!

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