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3x+(5x-40)=180
We move all terms to the left:
3x+(5x-40)-(180)=0
We get rid of parentheses
3x+5x-40-180=0
We add all the numbers together, and all the variables
8x-220=0
We move all terms containing x to the left, all other terms to the right
8x=220
x=220/8
x=27+1/2
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