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40=5w+15
We move all terms to the left:
40-(5w+15)=0
We get rid of parentheses
-5w-15+40=0
We add all the numbers together, and all the variables
-5w+25=0
We move all terms containing w to the left, all other terms to the right
-5w=-25
w=-25/-5
w=+5
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