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(9x+18)+(6x-3)=180
We move all terms to the left:
(9x+18)+(6x-3)-(180)=0
We get rid of parentheses
9x+6x+18-3-180=0
We add all the numbers together, and all the variables
15x-165=0
We move all terms containing x to the left, all other terms to the right
15x=165
x=165/15
x=11
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