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12w-22=15w-31
We move all terms to the left:
12w-22-(15w-31)=0
We get rid of parentheses
12w-15w+31-22=0
We add all the numbers together, and all the variables
-3w+9=0
We move all terms containing w to the left, all other terms to the right
-3w=-9
w=-9/-3
w=+3
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