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m in (-oo:+oo)
2*(-4*m-6) = -68 // + 68
2*(-4*m-6)+68 = 0
2*(-4*m-6)+68 = 0
56-8*m = 0
56-8*m = 0
56-8*m = 0 // - 56
-8*m = -56 // : -8
m = -56/(-8)
m = 7
m = 7
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