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(2x-30)+(x-30)=180
We move all terms to the left:
(2x-30)+(x-30)-(180)=0
We get rid of parentheses
2x+x-30-30-180=0
We add all the numbers together, and all the variables
3x-240=0
We move all terms containing x to the left, all other terms to the right
3x=240
x=240/3
x=80
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