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First, we address the parenthesis:
Remember that:
When we multiply a positive number by a negative number, the result will be negative.
When we multiply a negative number by a negative number, the result will be positive.
We obtain the following:
We join the x coefficients:
Lastly we obtain:
\( 100-(30-21)= \)
When you distribute a negative sign to a negative term, you get a positive! Think of it as: . Two negatives make a positive.
The same rule applies! Distribute the negative sign to every single term inside the parentheses. For example:
Look for like terms - terms with the same variable and same exponent. In , the two x terms can be combined:
You could simplify first, but it doesn't help here since these are different variables. It's better to distribute immediately when you see a negative sign before parentheses.
while . The first distributes a negative to each term, the second just groups two negative terms together.
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