-21=3x-10x

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Solution for -21=3x-10x equation: 



-21=3x-10x

We move all terms to the left:

-21-(3x-10x)=0

We add all the numbers together, and all the variables

-(-7x)-21=0

We get rid of parentheses

7x-21=0

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

7x=21

x=21/7

x=3

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