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13.5-6.f=42.3
We move all terms to the left:
13.5-6.f-(42.3)=0
We add all the numbers together, and all the variables
-6f-28.8=0
We move all terms containing f to the left, all other terms to the right
-6f=28.8
f=28.8/-6
f=-4+1.7142857142857/2.1428571428571
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