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90=(2x-4)
We move all terms to the left:
90-((2x-4))=0
We calculate terms in parentheses: -((2x-4)), so:We get rid of parentheses
(2x-4)
We get rid of parentheses
2x-4
Back to the equation:
-(2x-4)
-2x+4+90=0
We add all the numbers together, and all the variables
-2x+94=0
We move all terms containing x to the left, all other terms to the right
-2x=-94
x=-94/-2
x=+47
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