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m in (-oo:+oo)
m-(6*m)-1 = -26 // + 26
m-(6*m)-1+26 = 0
m-6*m-1+26 = 0
25-5*m = 0 // - 25
-5*m = -25 // : -5
m = -25/(-5)
m = 5
m = 5
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