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f in (-oo:+oo)
(f-9)/(-3) = (11-f)/5 // - (11-f)/5
(f-9)/(-3)-((11-f)/5) = 0
(f-9)/(-3)+(-1*(11-f))/5 = 0
(5*(f-9))/(-3*5)+(-3*(-1)*(11-f))/(-3*5) = 0
5*(f-9)-3*(-1)*(11-f) = 0
2*f-12 = 0
(2*f-12)/(-3*5) = 0
(2*f-12)/(-3*5) = 0 // * -3*5
2*f-12 = 0
2*f-12 = 0 // + 12
2*f = 12 // : 2
f = 12/2
f = 6
f = 6
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