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D( p )
1-(7*p) = 0
7*p-1 = 0
1-(7*p) = 0
1-(7*p) = 0
1-7*p = 0
1-7*p = 0 // - 1
-7*p = -1 // : -7
p = -1/(-7)
p = 1/7
7*p-1 = 0
7*p-1 = 0
7*p-1 = 0 // + 1
7*p = 1 // : 7
p = 1/7
p in (-oo:1/7) U (1/7:+oo)
(7*p)/(7*p-1)-(1/(1-(7*p))) = 0
(7*p)/(7*p-1)-(1-7*p)^-1 = 0
(7*p)/(7*p-1)-1/(1-7*p) = 0
(7*p*(1-7*p))/((7*p-1)*(1-7*p))+(-1*(7*p-1))/((7*p-1)*(1-7*p)) = 0
7*p*(1-7*p)-1*(7*p-1) = 0
1-49*p^2 = 0
(1-49*p^2)/((7*p-1)*(1-7*p)) = 0
(1-49*p^2)/((7*p-1)*(1-7*p)) = 0 // * (7*p-1)*(1-7*p)
1-49*p^2 = 0
-49*p^2 = -1 // : -49
p^2 = 1/49
p^2 = 1/49 // ^ 1/2
abs(p) = 1/7
p = 1/7 or p = -1/7
p in { 1/7}
p = -1/7
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