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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
84/f = -6 // + 6
84/f+6 = 0
84*f^-1 = -6 // : 84
f^-1 = -1/14
-1 < 0
1/(f^1) = -1/14 // * f^1
1 = -1/14*f^1 // : -1/14
-14 = f^1
f = -14
f = -14
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