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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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