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15=2w-2.5
We move all terms to the left:
15-(2w-2.5)=0
We get rid of parentheses
-2w+2.5+15=0
We add all the numbers together, and all the variables
-2w+17.5=0
We move all terms containing w to the left, all other terms to the right
-2w=-17.5
w=-17.5/-2
w=8+1/1.3333333333333
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