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90=(2x+5)+(9x-3)
We move all terms to the left:
90-((2x+5)+(9x-3))=0
We calculate terms in parentheses: -((2x+5)+(9x-3)), so:We get rid of parentheses
(2x+5)+(9x-3)
We get rid of parentheses
2x+9x+5-3
We add all the numbers together, and all the variables
11x+2
Back to the equation:
-(11x+2)
-11x-2+90=0
We add all the numbers together, and all the variables
-11x+88=0
We move all terms containing x to the left, all other terms to the right
-11x=-88
x=-88/-11
x=+8
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