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(4x-12)+(2x+42)+90=180
We move all terms to the left:
(4x-12)+(2x+42)+90-(180)=0
We add all the numbers together, and all the variables
(4x-12)+(2x+42)-90=0
We get rid of parentheses
4x+2x-12+42-90=0
We add all the numbers together, and all the variables
6x-60=0
We move all terms containing x to the left, all other terms to the right
6x=60
x=60/6
x=10
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