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7.5w+6=28.5
We move all terms to the left:
7.5w+6-(28.5)=0
We add all the numbers together, and all the variables
7.5w-22.5=0
We move all terms containing w to the left, all other terms to the right
7.5w=22.5
w=22.5/7.5
w=3
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