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m in (-oo:+oo)
(25/2)*m = 3*m^2+25/2 // - 3*m^2+25/2
(25/2)*m-(3*m^2)-(25/2) = 0
(25/2)*m-3*m^2-25/2 = 0
25/2*m-3*m^2-25/2 = 0
DELTA = (25/2)^2-(-25/2*(-3)*4)
DELTA = 25/4
DELTA > 0
m = ((25/4)^(1/2)-25/2)/(-3*2) or m = (-(25/4)^(1/2)-25/2)/(-3*2)
m = 5/3 or m = 5/2
m in { 5/3, 5/2 }
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