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m in (-oo:+oo)
36*m^2-(25/49) = 0
36*m^2-25/49 = 0
36*m^2 = 25/49 // : 36
m^2 = 25/1764
m^2 = 25/1764 // ^ 1/2
abs(m) = 5/42
m = 5/42 or m = -5/42
m in { 5/42, -5/42 }
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