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m in (-oo:+oo)
2*(9-6*m) = 126 // - 126
2*(9-6*m)-126 = 0
2*(9-6*m)-126 = 0
-12*m-108 = 0
-12*m-108 = 0
-12*m-108 = 0 // + 108
-12*m = 108 // : -12
m = 108/(-12)
m = -9
m = -9
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