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12w-20=10+15w
We move all terms to the left:
12w-20-(10+15w)=0
We add all the numbers together, and all the variables
12w-(15w+10)-20=0
We get rid of parentheses
12w-15w-10-20=0
We add all the numbers together, and all the variables
-3w-30=0
We move all terms containing w to the left, all other terms to the right
-3w=30
w=30/-3
w=-10
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