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-4w+7(w-4)=-13
We move all terms to the left:
-4w+7(w-4)-(-13)=0
We add all the numbers together, and all the variables
-4w+7(w-4)+13=0
We multiply parentheses
-4w+7w-28+13=0
We add all the numbers together, and all the variables
3w-15=0
We move all terms containing w to the left, all other terms to the right
3w=15
w=15/3
w=5
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