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(2x+12)+x+30=180
We move all terms to the left:
(2x+12)+x+30-(180)=0
We add all the numbers together, and all the variables
x+(2x+12)-150=0
We get rid of parentheses
x+2x+12-150=0
We add all the numbers together, and all the variables
3x-138=0
We move all terms containing x to the left, all other terms to the right
3x=138
x=138/3
x=46
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