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f in (-oo:+oo)
-42 = (3/4)*(f-4) // - (3/4)*(f-4)
-((3/4)*(f-4))-42 = 0
(-3/4)*(f-4)-42 = 0
-3/4*(f-4)-42 = 0
-3/4*(f-4)-42 = 0
-3/4*f-39 = 0
-3/4*f-39 = 0
-3/4*f-39 = 0 // + 39
-3/4*f = 39 // : -3/4
f = 39/(-3/4)
f = -52
f = -52
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