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(2x-142)+(x+16)=180
We move all terms to the left:
(2x-142)+(x+16)-(180)=0
We get rid of parentheses
2x+x-142+16-180=0
We add all the numbers together, and all the variables
3x-306=0
We move all terms containing x to the left, all other terms to the right
3x=306
x=306/3
x=102
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