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-8w+4(w+8)=12
We move all terms to the left:
-8w+4(w+8)-(12)=0
We multiply parentheses
-8w+4w+32-12=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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