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m in (-oo:+oo)
8/6 = m/9 // - m/9
8/6-(m/9) = 0
4/3-1/9*m = 0 // - 4/3
-1/9*m = -4/3 // : -1/9
m = -4/3/(-1/9)
m = 12
m = 12
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