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-4(w-2)=-7w+20
We move all terms to the left:
-4(w-2)-(-7w+20)=0
We multiply parentheses
-4w-(-7w+20)+8=0
We get rid of parentheses
-4w+7w-20+8=0
We add all the numbers together, and all the variables
3w-12=0
We move all terms containing w to the left, all other terms to the right
3w=12
w=12/3
w=4
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