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12=w/5+8
We move all terms to the left:
12-(w/5+8)=0
We get rid of parentheses
-w/5-8+12=0
We multiply all the terms by the denominator
-w-8*5+12*5=0
We add all the numbers together, and all the variables
-1w+20=0
We move all terms containing w to the left, all other terms to the right
-w=-20
w=-20/-1
w=+20
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