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(4x+42)=(2x-12)=4x
We move all terms to the left:
(4x+42)-((2x-12))=0
We get rid of parentheses
4x-((2x-12))+42=0
We calculate terms in parentheses: -((2x-12)), so:We get rid of parentheses
(2x-12)
We get rid of parentheses
2x-12
Back to the equation:
-(2x-12)
4x-2x+12+42=0
We add all the numbers together, and all the variables
2x+54=0
We move all terms containing x to the left, all other terms to the right
2x=-54
x=-54/2
x=-27
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