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m in (-oo:+oo)
(2/3)*m+1/9 = -2/9 // + -2/9
(2/3)*m+1/9-(-2/9) = 0
(2/3)*m+1/9+2/9 = 0
2/3*m+1/3 = 0 // - 1/3
2/3*m = -1/3 // : 2/3
m = -1/3/2/3
m = -1/2
m = -1/2
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