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45=3w+12
We move all terms to the left:
45-(3w+12)=0
We get rid of parentheses
-3w-12+45=0
We add all the numbers together, and all the variables
-3w+33=0
We move all terms containing w to the left, all other terms to the right
-3w=-33
w=-33/-3
w=+11
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