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D( p )
2*p-7 = 0
7-(2*p) = 0
2*p-7 = 0
2*p-7 = 0
2*p-7 = 0 // + 7
2*p = 7 // : 2
p = 7/2
7-(2*p) = 0
7-(2*p) = 0
7-2*p = 0
7-2*p = 0 // - 7
-2*p = -7 // : -2
p = -7/(-2)
p = 7/2
p in (-oo:7/2) U (7/2:+oo)
(3*p+11)/(7-(2*p))+(11*p-17)/(2*p-7) = 0
(3*p+11)/(7-2*p)+(11*p-17)/(2*p-7) = 0
((3*p+11)*(2*p-7))/((7-2*p)*(2*p-7))+((11*p-17)*(7-2*p))/((7-2*p)*(2*p-7)) = 0
(3*p+11)*(2*p-7)+(11*p-17)*(7-2*p) = 0
112*p-16*p^2-196 = 0
112*p-16*p^2-196 = 0
4*(28*p-4*p^2-49) = 0
28*p-4*p^2-49 = 0
DELTA = 28^2-(-49*(-4)*4)
DELTA = 0
p = -28/(-4*2)
p = 7/2 or p = 7/2
4*(p-7/2)^2 = 0
(4*(p-7/2)^2)/((7-2*p)*(2*p-7)) = 0
(4*(p-7/2)^2)/((7-2*p)*(2*p-7)) = 0 // * (7-2*p)*(2*p-7)
4*(p-7/2)^2 = 0
p-7/2 = 0 // + 7/2
p = 7/2
p in { 7/2}
p belongs to the empty set
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