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m in (-oo:+oo)
(m^2)/30 = m/6+1/5 // - m/6+1/5
(m^2)/30-(m/6)-(1/5) = 0
(m^2)/30-(m/6)-1/5 = 0
1/30*m^2-1/6*m-1/5 = 0
DELTA = (-1/6)^2-(-1/5*1/30*4)
DELTA = 49/900
DELTA > 0
m = ((49/900)^(1/2)+1/6)/(1/30*2) or m = (1/6-(49/900)^(1/2))/(1/30*2)
m = 6 or m = -1
m in { -1, 6 }
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