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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
15/f = 10/100 // - 10/100
15/f-(10/100) = 0
15/f-1/10 = 0
15*f^-1 = 1/10 // : 15
f^-1 = 1/150
-1 < 0
1/(f^1) = 1/150 // * f^1
1 = 1/150*f^1 // : 1/150
150 = f^1
f = 150
f = 150
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