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40=4w-8
We move all terms to the left:
40-(4w-8)=0
We get rid of parentheses
-4w+8+40=0
We add all the numbers together, and all the variables
-4w+48=0
We move all terms containing w to the left, all other terms to the right
-4w=-48
w=-48/-4
w=+12
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