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-12w-13=19-20w
We move all terms to the left:
-12w-13-(19-20w)=0
We add all the numbers together, and all the variables
-12w-(-20w+19)-13=0
We get rid of parentheses
-12w+20w-19-13=0
We add all the numbers together, and all the variables
8w-32=0
We move all terms containing w to the left, all other terms to the right
8w=32
w=32/8
w=4
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