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m in (-oo:+oo)
1-2*m = 5/9 // - 5/9
1-2*m-(5/9) = 0
1-2*m-5/9 = 0
4/9-2*m = 0 // - 4/9
-2*m = -4/9 // : -2
m = -4/9/(-2)
m = 2/9
m = 2/9
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