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90=2x+2(2x+15)
We move all terms to the left:
90-(2x+2(2x+15))=0
We calculate terms in parentheses: -(2x+2(2x+15)), so:We get rid of parentheses
2x+2(2x+15)
We multiply parentheses
2x+4x+30
We add all the numbers together, and all the variables
6x+30
Back to the equation:
-(6x+30)
-6x-30+90=0
We add all the numbers together, and all the variables
-6x+60=0
We move all terms containing x to the left, all other terms to the right
-6x=-60
x=-60/-6
x=+10
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