(3x-15)-21=-15

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Solution for (3x-15)-21=-15 equation: 



(3x-15)-21=-15

We move all terms to the left:

(3x-15)-21-(-15)=0

We add all the numbers together, and all the variables

(3x-15)-6=0

We get rid of parentheses

3x-15-6=0

We add all the numbers together, and all the variables

3x-21=0

We move all terms containing x to the left, all other terms to the right

3x=21

x=21/3

x=7

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