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m in (-oo:+oo)
3-6*m = 3*m+84 // - 3*m+84
3-6*m-(3*m)-84 = 0
3-6*m-3*m-84 = 0
-9*m-81 = 0 // + 81
-9*m = 81 // : -9
m = 81/(-9)
m = -9
m = -9
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