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m in (-oo:+oo)
(-2/3)*m+1/3 = -1/9 // + -1/9
(-2/3)*m+1/3-(-1/9) = 0
(-2/3)*m+1/3+1/9 = 0
4/9-2/3*m = 0 // - 4/9
-2/3*m = -4/9 // : -2/3
m = -4/9/(-2/3)
m = 2/3
m = 2/3
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