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-5.2f=-20.8
We move all terms to the left:
-5.2f-(-20.8)=0
We add all the numbers together, and all the variables
-5.2f+20.8=0
We move all terms containing f to the left, all other terms to the right
-5.2f=-20.8
f=-20.8/-5.2
f=+4
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