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90=(x+15)+50
We move all terms to the left:
90-((x+15)+50)=0
We calculate terms in parentheses: -((x+15)+50), so:We get rid of parentheses
(x+15)+50
We get rid of parentheses
x+15+50
We add all the numbers together, and all the variables
x+65
Back to the equation:
-(x+65)
-x-65+90=0
We add all the numbers together, and all the variables
-1x+25=0
We move all terms containing x to the left, all other terms to the right
-x=-25
x=-25/-1
x=+25
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