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m in (-oo:+oo)
-m-(2*m)-5 = -23 // + 23
23-m-(2*m)-5 = 0
23-m-2*m-5 = 0
18-3*m = 0 // - 18
-3*m = -18 // : -3
m = -18/(-3)
m = 6
m = 6
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