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

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Solution for -3x+7(-x+7)=-21 equation: 



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3x+7(-1x+7)-(-21)=0

We add all the numbers together, and all the variables

-3x+7(-1x+7)+21=0

We multiply parentheses

-3x-7x+49+21=0

We add all the numbers together, and all the variables

-10x+70=0

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

-10x=-70

x=-70/-10

x=+7

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