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(6x+9)+(2x+3)=180
We move all terms to the left:
(6x+9)+(2x+3)-(180)=0
We get rid of parentheses
6x+2x+9+3-180=0
We add all the numbers together, and all the variables
8x-168=0
We move all terms containing x to the left, all other terms to the right
8x=168
x=168/8
x=21
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