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m in (-oo:+oo)
m-(6*m)-1 = -31 // + 31
m-(6*m)-1+31 = 0
m-6*m-1+31 = 0
30-5*m = 0 // - 30
-5*m = -30 // : -5
m = -30/(-5)
m = 6
m = 6
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