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(3x-8)+(x-2)+90=180
We move all terms to the left:
(3x-8)+(x-2)+90-(180)=0
We add all the numbers together, and all the variables
(3x-8)+(x-2)-90=0
We get rid of parentheses
3x+x-8-2-90=0
We add all the numbers together, and all the variables
4x-100=0
We move all terms containing x to the left, all other terms to the right
4x=100
x=100/4
x=25
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