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88.1-1.3f-f=72.46
We move all terms to the left:
88.1-1.3f-f-(72.46)=0
We add all the numbers together, and all the variables
-2.3f+15.64=0
We move all terms containing f to the left, all other terms to the right
-2.3f=-15.64
f=-15.64/-2.3
f=6+1/1.25
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