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m in (-oo:+oo)
5-((3/5)*m)-(4*m) = -159/5 // + -159/5
5-((3/5)*m)-(4*m)-(-159/5) = 0
(-3/5)*m-4*m+159/5+5 = 0
184/5-23/5*m = 0 // - 184/5
-23/5*m = -184/5 // : -23/5
m = -184/5/(-23/5)
m = 8
m = 8
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