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(4x+12)=(2x+72)
We move all terms to the left:
(4x+12)-((2x+72))=0
We get rid of parentheses
4x-((2x+72))+12=0
We calculate terms in parentheses: -((2x+72)), so:We get rid of parentheses
(2x+72)
We get rid of parentheses
2x+72
Back to the equation:
-(2x+72)
4x-2x-72+12=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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