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-4w/7=20
We move all terms to the left:
-4w/7-(20)=0
We multiply all the terms by the denominator
-4w-20*7=0
We add all the numbers together, and all the variables
-4w-140=0
We move all terms containing w to the left, all other terms to the right
-4w=140
w=140/-4
w=-35
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