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m in (-oo:+oo)
-6*m-(2*m)-3 = -59 // + 59
59-6*m-(2*m)-3 = 0
59-6*m-2*m-3 = 0
56-8*m = 0 // - 56
-8*m = -56 // : -8
m = -56/(-8)
m = 7
m = 7
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