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12w-15=10w-9
We move all terms to the left:
12w-15-(10w-9)=0
We get rid of parentheses
12w-10w+9-15=0
We add all the numbers together, and all the variables
2w-6=0
We move all terms containing w to the left, all other terms to the right
2w=6
w=6/2
w=3
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