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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
1200 = (4*4)/p // - (4*4)/p
1200-((4*4)/p) = 0
1200-16*p^-1 = 0
-16*p^-1 = -1200 // : -16
p^-1 = 75
-1 < 0
1/(p^1) = 75 // * p^1
1 = 75*p^1 // : 75
1/75 = p^1
p = 1/75
p = 1/75
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