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m in (-oo:+oo)
9-(6*m) = 2*m+73 // - 2*m+73
9-(6*m)-(2*m)-73 = 0
9-6*m-2*m-73 = 0
-8*m-64 = 0 // + 64
-8*m = 64 // : -8
m = 64/(-8)
m = -8
m = -8
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