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19=w/6+21
We move all terms to the left:
19-(w/6+21)=0
We get rid of parentheses
-w/6-21+19=0
We multiply all the terms by the denominator
-w-21*6+19*6=0
We add all the numbers together, and all the variables
-1w-12=0
We move all terms containing w to the left, all other terms to the right
-w=12
w=12/-1
w=-12
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