-21=3x-6x

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Solution for -21=3x-6x equation: 



-21=3x-6x

We move all terms to the left:

-21-(3x-6x)=0

We add all the numbers together, and all the variables

-(-3x)-21=0

We get rid of parentheses

3x-21=0

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

3x=21

x=21/3

x=7

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