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(3x+5)+(5x+13)=180
We move all terms to the left:
(3x+5)+(5x+13)-(180)=0
We get rid of parentheses
3x+5x+5+13-180=0
We add all the numbers together, and all the variables
8x-162=0
We move all terms containing x to the left, all other terms to the right
8x=162
x=162/8
x=20+1/4
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