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m in (-oo:+oo)
2*m-8 = 6*m+28 // - 6*m+28
2*m-(6*m)-28-8 = 0
2*m-6*m-28-8 = 0
-4*m-36 = 0 // + 36
-4*m = 36 // : -4
m = 36/(-4)
m = -9
m = -9
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