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m in (-oo:+oo)
-3 = 5*m+6*m+8 // - 5*m+6*m+8
-(5*m)-(6*m)-8-3 = 0
-5*m-6*m-8-3 = 0
-11*m-11 = 0 // + 11
-11*m = 11 // : -11
m = 11/(-11)
m = -1
m = -1
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