90=(x+3)+(2x-3)

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Solution for 90=(x+3)+(2x-3) equation: 



90=(x+3)+(2x-3)

We move all terms to the left:

90-((x+3)+(2x-3))=0



We calculate terms in parentheses: -((x+3)+(2x-3)), so:

(x+3)+(2x-3)

We get rid of parentheses

x+2x+3-3

We add all the numbers together, and all the variables

3x

Back to the equation:

-(3x)



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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