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90+2(x-12)+x=180
We move all terms to the left:
90+2(x-12)+x-(180)=0
We add all the numbers together, and all the variables
x+2(x-12)-90=0
We multiply parentheses
x+2x-24-90=0
We add all the numbers together, and all the variables
3x-114=0
We move all terms containing x to the left, all other terms to the right
3x=114
x=114/3
x=38
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