90=x-3x

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Solution for 90=x-3x equation: 



90=x-3x

We move all terms to the left:

90-(x-3x)=0

We add all the numbers together, and all the variables

-(-2x)+90=0

We get rid of parentheses

2x+90=0

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

2x=-90

x=-90/2

x=-45

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