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15=20x-65
We move all terms to the left:
15-(20x-65)=0
We get rid of parentheses
-20x+65+15=0
We add all the numbers together, and all the variables
-20x+80=0
We move all terms containing x to the left, all other terms to the right
-20x=-80
x=-80/-20
x=+4
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