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f in (-oo:+oo)
31*(8*f-4) = (f-7)/12 // - (f-7)/12
31*(8*f-4)-((f-7)/12) = 0
31*(8*f-4)+(-1*(f-7))/12 = 0
(12*31*(8*f-4))/12+(-1*(f-7))/12 = 0
12*31*(8*f-4)-1*(f-7) = 0
2975*f-1481 = 0
(2975*f-1481)/12 = 0
(2975*f-1481)/12 = 0 // * 12
2975*f-1481 = 0
2975*f-1481 = 0 // + 1481
2975*f = 1481 // : 2975
f = 1481/2975
f = 1481/2975
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