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(2x+12)+90+42=180
We move all terms to the left:
(2x+12)+90+42-(180)=0
We add all the numbers together, and all the variables
(2x+12)-48=0
We get rid of parentheses
2x+12-48=0
We add all the numbers together, and all the variables
2x-36=0
We move all terms containing x to the left, all other terms to the right
2x=36
x=36/2
x=18
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