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m in (-oo:+oo)
9*m^2-(16/25) = 0
9*m^2-16/25 = 0
9*m^2 = 16/25 // : 9
m^2 = 16/225
m^2 = 16/225 // ^ 1/2
abs(m) = 4/15
m = 4/15 or m = -4/15
m in { 4/15, -4/15 }
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