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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

21x+21+21=0

We add all the numbers together, and all the variables

21x+42=0

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

21x=-42

x=-42/21

x=-2

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