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(7x+2)+90+(3x+8)=180
We move all terms to the left:
(7x+2)+90+(3x+8)-(180)=0
We add all the numbers together, and all the variables
(7x+2)+(3x+8)-90=0
We get rid of parentheses
7x+3x+2+8-90=0
We add all the numbers together, and all the variables
10x-80=0
We move all terms containing x to the left, all other terms to the right
10x=80
x=80/10
x=8
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