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(2x-15)+(3x-5)=180
We move all terms to the left:
(2x-15)+(3x-5)-(180)=0
We get rid of parentheses
2x+3x-15-5-180=0
We add all the numbers together, and all the variables
5x-200=0
We move all terms containing x to the left, all other terms to the right
5x=200
x=200/5
x=40
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