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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+12=0
We move all terms containing w to the left, all other terms to the right
-3w=-12
w=-12/-3
w=+4
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