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-15+5w=6+15+15w=21
We move all terms to the left:
-15+5w-(6+15+15w)=0
We add all the numbers together, and all the variables
5w-(15w+21)-15=0
We get rid of parentheses
5w-15w-21-15=0
We add all the numbers together, and all the variables
-10w-36=0
We move all terms containing w to the left, all other terms to the right
-10w=36
w=36/-10
w=-3+3/5
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