-8=-x-3x

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Solution for -8=-x-3x equation: 



-8=-x-3x

We move all terms to the left:

-8-(-x-3x)=0

We add all the numbers together, and all the variables

-(-4x)-8=0

We get rid of parentheses

4x-8=0

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

4x=8

x=8/4

x=2

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