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(2x-15)+(3x+10)+(4x-40)=180
We move all terms to the left:
(2x-15)+(3x+10)+(4x-40)-(180)=0
We get rid of parentheses
2x+3x+4x-15+10-40-180=0
We add all the numbers together, and all the variables
9x-225=0
We move all terms containing x to the left, all other terms to the right
9x=225
x=225/9
x=25
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