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12w-45=4w+51
We move all terms to the left:
12w-45-(4w+51)=0
We get rid of parentheses
12w-4w-51-45=0
We add all the numbers together, and all the variables
8w-96=0
We move all terms containing w to the left, all other terms to the right
8w=96
w=96/8
w=12
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