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(8x+90)+(3x+57)=180
We move all terms to the left:
(8x+90)+(3x+57)-(180)=0
We get rid of parentheses
8x+3x+90+57-180=0
We add all the numbers together, and all the variables
11x-33=0
We move all terms containing x to the left, all other terms to the right
11x=33
x=33/11
x=3
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