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-w/2=-10
We move all terms to the left:
-w/2-(-10)=0
We add all the numbers together, and all the variables
-w/2+10=0
We multiply all the terms by the denominator
-w+10*2=0
We add all the numbers together, and all the variables
-1w+20=0
We move all terms containing w to the left, all other terms to the right
-w=-20
w=-20/-1
w=+20
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