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m in (-oo:+oo)
6*m-(12/(-5))+6 = 0
6*m+12/5+6 = 0
6*m+42/5 = 0 // - 42/5
6*m = -42/5 // : 6
m = -42/5/6
m = -7/5
m = -7/5
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