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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
23-(9/f) = 5 // - 5
23-(9/f)-5 = 0
23-9*f^-1-5 = 0
-9*f^-1 = -18 // : -9
f^-1 = 2
-1 < 0
1/(f^1) = 2 // * f^1
1 = 2*f^1 // : 2
1/2 = f^1
f = 1/2
f = 1/2
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