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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
7/8 = 14/p // - 14/p
7/8-(14/p) = 0
7/8-14*p^-1 = 0
-14*p^-1 = -7/8 // : -14
p^-1 = 1/16
-1 < 0
1/(p^1) = 1/16 // * p^1
1 = 1/16*p^1 // : 1/16
16 = p^1
p = 16
p = 16
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