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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
5/f = 7/18 // - 7/18
5/f-(7/18) = 0
5/f-7/18 = 0
5*f^-1 = 7/18 // : 5
f^-1 = 7/90
-1 < 0
1/(f^1) = 7/90 // * f^1
1 = 7/90*f^1 // : 7/90
90/7 = f^1
f = 90/7
f = 90/7
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