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90+(7x-1)+(4x+3)=180
We move all terms to the left:
90+(7x-1)+(4x+3)-(180)=0
We add all the numbers together, and all the variables
(7x-1)+(4x+3)-90=0
We get rid of parentheses
7x+4x-1+3-90=0
We add all the numbers together, and all the variables
11x-88=0
We move all terms containing x to the left, all other terms to the right
11x=88
x=88/11
x=8
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