90=(4x-2x)

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Solution for 90=(4x-2x) equation: 



90=(4x-2x)

We move all terms to the left:

90-((4x-2x))=0

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -((+2x)), so:

(+2x)

We get rid of parentheses

2x

Back to the equation:

-(2x)



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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