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m in (-oo:+oo)
(1/3)*m+(2/3)*m = (2/3)*m-(2/3) // - (2/3)*m-(2/3)
(1/3)*m+(2/3)*m-((2/3)*m)+2/3 = 0
(1/3)*m+(2/3)*m+(-2/3)*m+2/3 = 0
1/3*m+2/3 = 0 // - 2/3
1/3*m = -2/3 // : 1/3
m = -2/3/1/3
m = -2
m = -2
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