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.7w-2=12.8
We move all terms to the left:
.7w-2-(12.8)=0
We add all the numbers together, and all the variables
.7w-14.8=0
We move all terms containing w to the left, all other terms to the right
.7w=14.8
w=14.8/.7
w=21+0.1/.7
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