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m in (-oo:+oo)
3/9 = 3*m // - 3*m
3/9-(3*m) = 0
3/9-3*m = 0
1/3-3*m = 0 // - 1/3
-3*m = -1/3 // : -3
m = -1/3/(-3)
m = 1/9
m = 1/9
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