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(8x-15)+(7x-30)=180
We move all terms to the left:
(8x-15)+(7x-30)-(180)=0
We get rid of parentheses
8x+7x-15-30-180=0
We add all the numbers together, and all the variables
15x-225=0
We move all terms containing x to the left, all other terms to the right
15x=225
x=225/15
x=15
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