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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
14/4-(7/p) = 0
14/4-7*p^-1 = 0
-7*p^-1 = -7/2 // : -7
p^-1 = 1/2
-1 < 0
1/(p^1) = 1/2 // * p^1
1 = 1/2*p^1 // : 1/2
2 = p^1
p = 2
p = 2
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