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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
12/f-7 = -5 // + 5
12/f-7+5 = 0
12*f^-1 = 2 // : 12
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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