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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/10 = 18/p // - 18/p
9/10-(18/p) = 0
9/10-18*p^-1 = 0
-18*p^-1 = -9/10 // : -18
p^-1 = 1/20
-1 < 0
1/(p^1) = 1/20 // * p^1
1 = 1/20*p^1 // : 1/20
20 = p^1
p = 20
p = 20
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