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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
12/f = -3 // + 3
12/f+3 = 0
12*f^-1 = -3 // : 12
f^-1 = -1/4
-1 < 0
1/(f^1) = -1/4 // * f^1
1 = -1/4*f^1 // : -1/4
-4 = f^1
f = -4
f = -4
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