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m in (-oo:+oo)
-19/9 = (-1/2)*m-((8/3)*m) // - (-1/2)*m-((8/3)*m)
(8/3)*m-((-1/2)*m)-19/9 = 0
(1/2)*m+(8/3)*m-19/9 = 0
19/6*m-19/9 = 0 // + 19/9
19/6*m = 19/9 // : 19/6
m = 19/9/19/6
m = 2/3
m = 2/3
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