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(2x-30)+(3x-40)=180
We move all terms to the left:
(2x-30)+(3x-40)-(180)=0
We get rid of parentheses
2x+3x-30-40-180=0
We add all the numbers together, and all the variables
5x-250=0
We move all terms containing x to the left, all other terms to the right
5x=250
x=250/5
x=50
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