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30=w/4+15
We move all terms to the left:
30-(w/4+15)=0
We get rid of parentheses
-w/4-15+30=0
We multiply all the terms by the denominator
-w-15*4+30*4=0
We add all the numbers together, and all the variables
-1w+60=0
We move all terms containing w to the left, all other terms to the right
-w=-60
w=-60/-1
w=+60
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