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