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m in (-oo:+oo)
162/5 = (4/5)*m+4*m-6 // - (4/5)*m+4*m-6
162/5-((4/5)*m)-(4*m)+6 = 0
(-4/5)*m-4*m+162/5+6 = 0
192/5-24/5*m = 0 // - 192/5
-24/5*m = -192/5 // : -24/5
m = -192/5/(-24/5)
m = 8
m = 8
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