21=-x-2x

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Solution for 21=-x-2x equation: 



21=-x-2x

We move all terms to the left:

21-(-x-2x)=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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