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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
18/8 = 4.5/f // - 4.5/f
18/8-(4.5/f) = 0
18/8-4.5*f^-1 = 0
-4.5*f^-1 = -9/4 // : -4.5
f^-1 = 0.5
-1 < 0
1/(f^1) = 0.5 // * f^1
1 = 0.5*f^1 // : 0.5
2 = f^1
f = 2
f = 2
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