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(9x+39)+(11x+61)=180
We move all terms to the left:
(9x+39)+(11x+61)-(180)=0
We get rid of parentheses
9x+11x+39+61-180=0
We add all the numbers together, and all the variables
20x-80=0
We move all terms containing x to the left, all other terms to the right
20x=80
x=80/20
x=4
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