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m in (-oo:+oo)
18/4 = m/6 // - m/6
18/4-(m/6) = 0
9/2-1/6*m = 0 // - 9/2
-1/6*m = -9/2 // : -1/6
m = -9/2/(-1/6)
m = 27
m = 27
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