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m in (-oo:+oo)
-6*m-(6*m)-6 = -54 // + 54
54-6*m-(6*m)-6 = 0
54-6*m-6*m-6 = 0
48-12*m = 0 // - 48
-12*m = -48 // : -12
m = -48/(-12)
m = 4
m = 4
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