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m in (-oo:+oo)
9-(5*m) = 33/7 // - 33/7
9-(5*m)-(33/7) = 0
9-5*m-33/7 = 0
30/7-5*m = 0 // - 30/7
-5*m = -30/7 // : -5
m = -30/7/(-5)
m = 6/7
m = 6/7
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