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m in (-oo:+oo)
3*m-((m/3)*m) = 0
(-1/3)*m^2+3*m = 0
3*m-1/3*m^2 = 0
DELTA = 3^2-(-1/3*0*4)
DELTA = 9
DELTA > 0
m = (9^(1/2)-3)/(-1/3*2) or m = (-9^(1/2)-3)/(-1/3*2)
m = 0 or m = 9
m in { 0, 9 }
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