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(7x-9)+(4x-3)+x=180
We move all terms to the left:
(7x-9)+(4x-3)+x-(180)=0
We add all the numbers together, and all the variables
x+(7x-9)+(4x-3)-180=0
We get rid of parentheses
x+7x+4x-9-3-180=0
We add all the numbers together, and all the variables
12x-192=0
We move all terms containing x to the left, all other terms to the right
12x=192
x=192/12
x=16
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