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(5x+3)+(x-9)=180
We move all terms to the left:
(5x+3)+(x-9)-(180)=0
We get rid of parentheses
5x+x+3-9-180=0
We add all the numbers together, and all the variables
6x-186=0
We move all terms containing x to the left, all other terms to the right
6x=186
x=186/6
x=31
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