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f in (-oo:+oo)
(7-(3*f))/4 = 2 // - 2
(7-(3*f))/4-2 = 0
(7-3*f)/4-2 = 0
(7-3*f)/4+(-2*4)/4 = 0
7-3*f-2*4 = 0
-3*f-1 = 0
(-3*f-1)/4 = 0
(-3*f-1)/4 = 0 // * 4
-3*f-1 = 0
-3*f-1 = 0 // + 1
-3*f = 1 // : -3
f = 1/(-3)
f = -1/3
f = -1/3
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