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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

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

We get rid of parentheses

-21x+7x+21+21=0

We add all the numbers together, and all the variables

-14x+42=0

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

-14x=-42

x=-42/-14

x=+3

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