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m in (-oo:+oo)
(-4/(-5))*m = 6 // - 6
(-4/(-5))*m-6 = 0
4/5*m-6 = 0 // + 6
4/5*m = 6 // : 4/5
m = 6/4/5
m = 15/2
m = 15/2
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