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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
-72/f = -12 // + 12
12-72/f = 0
-72*f^-1 = -12 // : -72
f^-1 = 1/6
-1 < 0
1/(f^1) = 1/6 // * f^1
1 = 1/6*f^1 // : 1/6
6 = f^1
f = 6
f = 6
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