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m in (-oo:+oo)
36*m^2-(49/4) = 0
36*m^2-49/4 = 0
36*m^2 = 49/4 // : 36
m^2 = 49/144
m^2 = 49/144 // ^ 1/2
abs(m) = 7/12
m = 7/12 or m = -7/12
m in { 7/12, -7/12 }
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