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(9x-81)+(7x-27)=180
We move all terms to the left:
(9x-81)+(7x-27)-(180)=0
We get rid of parentheses
9x+7x-81-27-180=0
We add all the numbers together, and all the variables
16x-288=0
We move all terms containing x to the left, all other terms to the right
16x=288
x=288/16
x=18
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