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m in (-oo:+oo)
16*m^2-(16/25) = 0
16*m^2-16/25 = 0
16*m^2 = 16/25 // : 16
m^2 = 1/25
m^2 = 1/25 // ^ 1/2
abs(m) = 1/5
m = 1/5 or m = -1/5
m in { 1/5, -1/5 }
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