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(4x-40)+3x=180
We move all terms to the left:
(4x-40)+3x-(180)=0
We add all the numbers together, and all the variables
3x+(4x-40)-180=0
We get rid of parentheses
3x+4x-40-180=0
We add all the numbers together, and all the variables
7x-220=0
We move all terms containing x to the left, all other terms to the right
7x=220
x=220/7
x=31+3/7
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