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-2.5f=12.5
We move all terms to the left:
-2.5f-(12.5)=0
We add all the numbers together, and all the variables
-2.5f-12.5=0
We move all terms containing f to the left, all other terms to the right
-2.5f=12.5
f=12.5/-2.5
f=-5
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