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m in (-oo:+oo)
25-((9/25)*m^2) = 0
(-9/25)*m^2+25 = 0
-9/25*m^2 = -25 // : -9/25
m^2 = 625/9
m^2 = 625/9 // ^ 1/2
abs(m) = 25/3
m = 25/3 or m = -25/3
m in { 25/3, -25/3 }
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