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(3x+7)+(6x+11)+90=180
We move all terms to the left:
(3x+7)+(6x+11)+90-(180)=0
We add all the numbers together, and all the variables
(3x+7)+(6x+11)-90=0
We get rid of parentheses
3x+6x+7+11-90=0
We add all the numbers together, and all the variables
9x-72=0
We move all terms containing x to the left, all other terms to the right
9x=72
x=72/9
x=8
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