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(9x+13)+(10x+15)=180
We move all terms to the left:
(9x+13)+(10x+15)-(180)=0
We get rid of parentheses
9x+10x+13+15-180=0
We add all the numbers together, and all the variables
19x-152=0
We move all terms containing x to the left, all other terms to the right
19x=152
x=152/19
x=8
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