9x-(7x+7)=9x+21

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Solution for 9x-(7x+7)=9x+21 equation: 



9x-(7x+7)=9x+21

We move all terms to the left:

9x-(7x+7)-(9x+21)=0

We get rid of parentheses

9x-7x-9x-7-21=0

We add all the numbers together, and all the variables

-7x-28=0

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

-7x=28

x=28/-7

x=-4

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