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x+(x+87)+(x-12)=180
We move all terms to the left:
x+(x+87)+(x-12)-(180)=0
We get rid of parentheses
x+x+x+87-12-180=0
We add all the numbers together, and all the variables
3x-105=0
We move all terms containing x to the left, all other terms to the right
3x=105
x=105/3
x=35
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