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3w=75-12w
We move all terms to the left:
3w-(75-12w)=0
We add all the numbers together, and all the variables
3w-(-12w+75)=0
We get rid of parentheses
3w+12w-75=0
We add all the numbers together, and all the variables
15w-75=0
We move all terms containing w to the left, all other terms to the right
15w=75
w=75/15
w=5
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