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