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12=w/3-13
We move all terms to the left:
12-(w/3-13)=0
We get rid of parentheses
-w/3+13+12=0
We multiply all the terms by the denominator
-w+13*3+12*3=0
We add all the numbers together, and all the variables
-1w+75=0
We move all terms containing w to the left, all other terms to the right
-w=-75
w=-75/-1
w=+75
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