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15=w/7+11
We move all terms to the left:
15-(w/7+11)=0
We get rid of parentheses
-w/7-11+15=0
We multiply all the terms by the denominator
-w-11*7+15*7=0
We add all the numbers together, and all the variables
-1w+28=0
We move all terms containing w to the left, all other terms to the right
-w=-28
w=-28/-1
w=+28
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