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x+(x+12)+100=180
We move all terms to the left:
x+(x+12)+100-(180)=0
We add all the numbers together, and all the variables
x+(x+12)-80=0
We get rid of parentheses
x+x+12-80=0
We add all the numbers together, and all the variables
2x-68=0
We move all terms containing x to the left, all other terms to the right
2x=68
x=68/2
x=34
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