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90=2(4x+1)
We move all terms to the left:
90-(2(4x+1))=0
We calculate terms in parentheses: -(2(4x+1)), so:We get rid of parentheses
2(4x+1)
We multiply parentheses
8x+2
Back to the equation:
-(8x+2)
-8x-2+90=0
We add all the numbers together, and all the variables
-8x+88=0
We move all terms containing x to the left, all other terms to the right
-8x=-88
x=-88/-8
x=+11
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