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(15x+50)+(12x-5)=180
We move all terms to the left:
(15x+50)+(12x-5)-(180)=0
We get rid of parentheses
15x+12x+50-5-180=0
We add all the numbers together, and all the variables
27x-135=0
We move all terms containing x to the left, all other terms to the right
27x=135
x=135/27
x=5
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