Examples with solutions for Solving an Equation by Multiplication/ Division: Number of terms

Exercise #1

6x24+2x+2=5 6x\cdot2-4+2x+2=5

Video Solution

Step-by-Step Solution

To solve the linear equation 6x24+2x+2=5 6x \cdot 2 - 4 + 2x + 2 = 5 , follow these steps:

  • Step 1: Simplify the expression on the left-hand side of the equation.
  • Step 2: Combine like terms to reduce the equation.
  • Step 3: Isolate the variable x x to determine its value.

Let's simplify and solve the given equation:

Step 1: Simplify the expression 6x24+2x+2 6x \cdot 2 - 4 + 2x + 2 .
This becomes 12x4+2x+2 12x - 4 + 2x + 2 .

Step 2: Combine like terms.
Combine the terms involving x x : 12x+2x=14x 12x + 2x = 14x .
Combine the constants: 4+2=2-4 + 2 = -2.
This results in the equation 14x2=5 14x - 2 = 5 .

Step 3: Isolate x x .
Add 2 to both sides to eliminate the constant on the left:
14x2+2=5+2 14x - 2 + 2 = 5 + 2 .
This simplifies to 14x=7 14x = 7 .
Next, divide both sides by 14 to solve for x x :
x=714 x = \frac{7}{14} .

Simplify the fraction:x=12 x = \frac{1}{2} .

Therefore, the solution to the equation is x=12 x = \frac{1}{2} .

Answer

x=12 x=\frac{1}{2}

Exercise #2

5x43+4x+3x=0 5x-4\cdot3+4x+3x=0

Video Solution

Step-by-Step Solution

To solve this linear equation 5x43+4x+3x=0 5x - 4 \cdot 3 + 4x + 3x = 0 , follow these steps:

  • Simplify the expression: First, calculate the product 43 4 \cdot 3 . This equals 12 12 .

  • Substitute back into the equation: 5x12+4x+3x=0 5x - 12 + 4x + 3x = 0 .

  • Combine like terms:

    • The terms involving x x are 5x 5x , 4x 4x , and 3x 3x . Add these together: 5x+4x+3x=12x 5x + 4x + 3x = 12x .

  • The equation now simplifies to 12x12=0 12x - 12 = 0 .

  • Isolate x x : Add 12 12 to both sides of the equation to eliminate the constant term on the left:

    • 12x12+12=0+12 12x - 12 + 12 = 0 + 12 , which simplifies to 12x=12 12x = 12 .

  • Solve for x x : Divide both sides by 12 12 to solve for x x :

    • x=1212=1 x = \frac{12}{12} = 1 .

The solution to the equation is x=1 x = 1 .

Verify with the given choices, we find that the correct answer is: x=1 x = 1 .

Answer

x=1 x=1

Exercise #3

3+4x21+4x=17 3+4x-2\cdot1+4x=17

Video Solution

Step-by-Step Solution

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

  • Simplify the equation by combining like terms.
  • Isolate x x on one side of the equation.
  • Solve for x x .

Now, let's work through each step:
First, simplify the expression on the left side of the equation:

3+4x21+4x=17 3 + 4x - 2 \cdot 1 + 4x = 17

Calculate 21 2 \cdot 1 , which is 2 2 . Then, replace that in the equation:

3+4x2+4x=17 3 + 4x - 2 + 4x = 17

Next, combine the constant terms 3 3 and 2-2:

(32)+4x+4x=17 (3 - 2) + 4x + 4x = 17

This simplifies to:

1+4x+4x=17 1 + 4x + 4x = 17

Now, combine the x x -terms:

1+8x=17 1 + 8x = 17

Isolate the x x -term by subtracting 1 1 from both sides:

8x=171 8x = 17 - 1

This simplifies to:

8x=16 8x = 16

Finally, solve for x x by dividing both sides by 8 8 :

x=168 x = \frac{16}{8}

Which simplifies to:

x=2 x = 2

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

Answer

x=2 x=2