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6.5f-7f=17.5
We move all terms to the left:
6.5f-7f-(17.5)=0
We add all the numbers together, and all the variables
-0.5f-17.5=0
We move all terms containing f to the left, all other terms to the right
-0.5f=17.5
f=17.5/-0.5
f=-35
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