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(2x+9)+(x+15)+90=180
We move all terms to the left:
(2x+9)+(x+15)+90-(180)=0
We add all the numbers together, and all the variables
(2x+9)+(x+15)-90=0
We get rid of parentheses
2x+x+9+15-90=0
We add all the numbers together, and all the variables
3x-66=0
We move all terms containing x to the left, all other terms to the right
3x=66
x=66/3
x=22
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