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(2x+9)+(3x+16)=180
We move all terms to the left:
(2x+9)+(3x+16)-(180)=0
We get rid of parentheses
2x+3x+9+16-180=0
We add all the numbers together, and all the variables
5x-155=0
We move all terms containing x to the left, all other terms to the right
5x=155
x=155/5
x=31
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