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m in (-oo:+oo)
64-((1/25)*m^2) = 0
(-1/25)*m^2+64 = 0
-1/25*m^2 = -64 // : -1/25
m^2 = 1600
m^2 = 1600 // ^ 1/2
abs(m) = 40
m = 40 or m = -40
m in { 40, -40 }
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