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-12.5+2w=33.7
We move all terms to the left:
-12.5+2w-(33.7)=0
We add all the numbers together, and all the variables
2w-46.2=0
We move all terms containing w to the left, all other terms to the right
2w=46.2
w=46.2/2
w=23+0.2/2
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