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f in (-oo:+oo)
(f+7)/(-14) = -15 // + 15
(f+7)/(-14)+15 = 0
(f+7)/(-14)+(-14*15)/(-14) = 0
f-14*15+7 = 0
f-203 = 0
(f-203)/(-14) = 0
(f-203)/(-14) = 0 // * -14
f-203 = 0
f-203 = 0 // + 203
f = 203
f = 203
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