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0.5w-89.5=80
We move all terms to the left:
0.5w-89.5-(80)=0
We add all the numbers together, and all the variables
0.5w-169.5=0
We move all terms containing w to the left, all other terms to the right
0.5w=169.5
w=169.5/0.5
w=339
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