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(3x)+(5x+11)+(x-2)=180
We move all terms to the left:
(3x)+(5x+11)+(x-2)-(180)=0
We get rid of parentheses
3x+5x+x+11-2-180=0
We add all the numbers together, and all the variables
9x-171=0
We move all terms containing x to the left, all other terms to the right
9x=171
x=171/9
x=19
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