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m in (-oo:+oo)
5/6 = m/9 // - m/9
5/6-(m/9) = 0
5/6-1/9*m = 0 // - 5/6
-1/9*m = -5/6 // : -1/9
m = -5/6/(-1/9)
m = 15/2
m = 15/2
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