90=(2x)+(x)

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Solution for 90=(2x)+(x) equation: 



90=(2x)+(x)

We move all terms to the left:

90-((2x)+(x))=0

We add all the numbers together, and all the variables

-(+3x)+90=0

We get rid of parentheses

-3x+90=0

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

-3x=-90

x=-90/-3

x=+30

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