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(10x+5)+(8x+13)=180
We move all terms to the left:
(10x+5)+(8x+13)-(180)=0
We get rid of parentheses
10x+8x+5+13-180=0
We add all the numbers together, and all the variables
18x-162=0
We move all terms containing x to the left, all other terms to the right
18x=162
x=162/18
x=9
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