-21-21x=21-7x

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Solution for -21-21x=21-7x equation: 



-21-21x=21-7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-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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