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(10x-8)+(9x+18)=180
We move all terms to the left:
(10x-8)+(9x+18)-(180)=0
We get rid of parentheses
10x+9x-8+18-180=0
We add all the numbers together, and all the variables
19x-170=0
We move all terms containing x to the left, all other terms to the right
19x=170
x=170/19
x=8+18/19
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