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m in (-oo:+oo)
4-((1/25)*m^2) = 0
(-1/25)*m^2+4 = 0
-1/25*m^2 = -4 // : -1/25
m^2 = 100
m^2 = 100 // ^ 1/2
abs(m) = 10
m = 10 or m = -10
m in { 10, -10 }
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