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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
100/p = 90/45 // - 90/45
100/p-(90/45) = 0
100/p-2 = 0
100*p^-1 = 2 // : 100
p^-1 = 1/50
-1 < 0
1/(p^1) = 1/50 // * p^1
1 = 1/50*p^1 // : 1/50
50 = p^1
p = 50
p = 50
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