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50=5w-15
We move all terms to the left:
50-(5w-15)=0
We get rid of parentheses
-5w+15+50=0
We add all the numbers together, and all the variables
-5w+65=0
We move all terms containing w to the left, all other terms to the right
-5w=-65
w=-65/-5
w=+13
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