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m in (-oo:+oo)
2*m-4 = 6*m+16 // - 6*m+16
2*m-(6*m)-16-4 = 0
2*m-6*m-16-4 = 0
-4*m-20 = 0 // + 20
-4*m = 20 // : -4
m = 20/(-4)
m = -5
m = -5
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