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f in (-oo:+oo)
286 = (f-612)/13 // - (f-612)/13
286-((f-612)/13) = 0
(-1*(f-612))/13+286 = 0
(-1*(f-612))/13+(13*286)/13 = 0
13*286-1*(f-612) = 0
4330-f = 0
(4330-f)/13 = 0
(4330-f)/13 = 0 // * 13
4330-f = 0
4330-f = 0 // - 4330
-f = -4330 // * -1
f = 4330
f = 4330
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