-15-3x=21-7x

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Solution for -15-3x=21-7x equation: 



-15-3x=21-7x

We move all terms to the left:

-15-3x-(21-7x)=0

We add all the numbers together, and all the variables

-3x-(-7x+21)-15=0

We get rid of parentheses

-3x+7x-21-15=0

We add all the numbers together, and all the variables

4x-36=0

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

4x=36

x=36/4

x=9

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