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(3x+3)+(5x-1)+90=180
We move all terms to the left:
(3x+3)+(5x-1)+90-(180)=0
We add all the numbers together, and all the variables
(3x+3)+(5x-1)-90=0
We get rid of parentheses
3x+5x+3-1-90=0
We add all the numbers together, and all the variables
8x-88=0
We move all terms containing x to the left, all other terms to the right
8x=88
x=88/8
x=11
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