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m in (-oo:+oo)
-6*m-9 = 3*m-27 // - 3*m-27
27-6*m-(3*m)-9 = 0
27-6*m-3*m-9 = 0
18-9*m = 0 // - 18
-9*m = -18 // : -9
m = -18/(-9)
m = 2
m = 2
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