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-20+100=8w+8w
We move all terms to the left:
-20+100-(8w+8w)=0
We add all the numbers together, and all the variables
-(+16w)-20+100=0
We add all the numbers together, and all the variables
-(+16w)+80=0
We get rid of parentheses
-16w+80=0
We move all terms containing w to the left, all other terms to the right
-16w=-80
w=-80/-16
w=+5
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