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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
5/f-22 = -25 // + 25
5/f-22+25 = 0
5*f^-1 = -3 // : 5
f^-1 = -3/5
-1 < 0
1/(f^1) = -3/5 // * f^1
1 = -3/5*f^1 // : -3/5
-5/3 = f^1
f = -5/3
f = -5/3
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