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-10=-20+w
We move all terms to the left:
-10-(-20+w)=0
We add all the numbers together, and all the variables
-(w-20)-10=0
We get rid of parentheses
-w+20-10=0
We add all the numbers together, and all the variables
-1w+10=0
We move all terms containing w to the left, all other terms to the right
-w=-10
w=-10/-1
w=+10
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