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9.3f-6.2f=12.4
We move all terms to the left:
9.3f-6.2f-(12.4)=0
We add all the numbers together, and all the variables
3.1f-12.4=0
We move all terms containing f to the left, all other terms to the right
3.1f=12.4
f=12.4/3.1
f=4
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