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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
2/f-6 = 8 // - 8
2/f-8-6 = 0
2*f^-1 = 14 // : 2
f^-1 = 7
-1 < 0
1/(f^1) = 7 // * f^1
1 = 7*f^1 // : 7
1/7 = f^1
f = 1/7
f = 1/7
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