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D( m )
3*m+3 = 0
3*m+3 = 0
3*m+3 = 0
3*m+3 = 0 // - 3
3*m = -3 // : 3
m = -3/3
m = -1
m in (-oo:-1) U (-1:+oo)
(7*m)/(3*m+3)-5 = (3/2)*m // - (3/2)*m
(7*m)/(3*m+3)-((3/2)*m)-5 = 0
(7*m)/(3*m+3)+(-3/2)*m-5 = 0
(7*m)/(3*m+3)+(-3*m)/2-5 = 0
(2*7*m)/(2*(3*m+3))+(-3*m*(3*m+3))/(2*(3*m+3))+(-5*2*(3*m+3))/(2*(3*m+3)) = 0
2*7*m-3*m*(3*m+3)-5*2*(3*m+3) = 0
5*m-9*m^2-30*m-30 = 0
-9*m^2-25*m-30 = 0
-9*m^2-25*m-30 = 0
-1*(9*m^2+25*m+30) = 0
9*m^2+25*m+30 = 0
DELTA = 25^2-(4*9*30)
DELTA = -455
DELTA < 0
-1 = 0
-1/(2*(3*m+3)) = 0
-1/(2*(3*m+3)) = 0 // * 2*(3*m+3)
-1 = 0
m belongs to the empty set
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