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(2x+5)+(7x-40)=180
We move all terms to the left:
(2x+5)+(7x-40)-(180)=0
We get rid of parentheses
2x+7x+5-40-180=0
We add all the numbers together, and all the variables
9x-215=0
We move all terms containing x to the left, all other terms to the right
9x=215
x=215/9
x=23+8/9
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