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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
-12/f = -3 // + 3
3-12/f = 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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