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m in (-oo:+oo)
-2*m-9 = 6*m-57 // - 6*m-57
57-2*m-(6*m)-9 = 0
57-2*m-6*m-9 = 0
48-8*m = 0 // - 48
-8*m = -48 // : -8
m = -48/(-8)
m = 6
m = 6
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