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19=4w-1
We move all terms to the left:
19-(4w-1)=0
We get rid of parentheses
-4w+1+19=0
We add all the numbers together, and all the variables
-4w+20=0
We move all terms containing w to the left, all other terms to the right
-4w=-20
w=-20/-4
w=+5
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