-63=-21+6x-12x

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Solution for -63=-21+6x-12x equation: 



-63=-21+6x-12x

We move all terms to the left:

-63-(-21+6x-12x)=0

We add all the numbers together, and all the variables

-(-6x-21)-63=0

We get rid of parentheses

6x+21-63=0

We add all the numbers together, and all the variables

6x-42=0

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

6x=42

x=42/6

x=7

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