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m in (-oo:+oo)
9-((4/9)*m^2) = 0
(-4/9)*m^2+9 = 0
-4/9*m^2 = -9 // : -4/9
m^2 = 81/4
m^2 = 81/4 // ^ 1/2
abs(m) = 9/2
m = 9/2 or m = -9/2
m in { 9/2, -9/2 }
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