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