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-7w+5(w+4)=8
We move all terms to the left:
-7w+5(w+4)-(8)=0
We multiply parentheses
-7w+5w+20-8=0
We add all the numbers together, and all the variables
-2w+12=0
We move all terms containing w to the left, all other terms to the right
-2w=-12
w=-12/-2
w=+6
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