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