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(x+3)+(x-12)=180
We move all terms to the left:
(x+3)+(x-12)-(180)=0
We get rid of parentheses
x+x+3-12-180=0
We add all the numbers together, and all the variables
2x-189=0
We move all terms containing x to the left, all other terms to the right
2x=189
x=189/2
x=94+1/2
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