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15=3w-3
We move all terms to the left:
15-(3w-3)=0
We get rid of parentheses
-3w+3+15=0
We add all the numbers together, and all the variables
-3w+18=0
We move all terms containing w to the left, all other terms to the right
-3w=-18
w=-18/-3
w=+6
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