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19w-40=12w-5
We move all terms to the left:
19w-40-(12w-5)=0
We get rid of parentheses
19w-12w+5-40=0
We add all the numbers together, and all the variables
7w-35=0
We move all terms containing w to the left, all other terms to the right
7w=35
w=35/7
w=5
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