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(2x+6)+(3x+9)=180
We move all terms to the left:
(2x+6)+(3x+9)-(180)=0
We get rid of parentheses
2x+3x+6+9-180=0
We add all the numbers together, and all the variables
5x-165=0
We move all terms containing x to the left, all other terms to the right
5x=165
x=165/5
x=33
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