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m in (-oo:+oo)
-m-(5*m)-10 = -58 // + 58
58-m-(5*m)-10 = 0
58-m-5*m-10 = 0
48-6*m = 0 // - 48
-6*m = -48 // : -6
m = -48/(-6)
m = 8
m = 8
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