-8x-(7x-7)=-21-8x

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Solution for -8x-(7x-7)=-21-8x equation: 



-8x-(7x-7)=-21-8x

We move all terms to the left:

-8x-(7x-7)-(-21-8x)=0

We add all the numbers together, and all the variables

-8x-(7x-7)-(-8x-21)=0

We get rid of parentheses

-8x-7x+8x+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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