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m in (-oo:+oo)
8-((3/5)*m) = 91/11 // - 91/11
8-((3/5)*m)-(91/11) = 0
(-3/5)*m-91/11+8 = 0
-3/5*m-3/11 = 0 // + 3/11
-3/5*m = 3/11 // : -3/5
m = 3/11/(-3/5)
m = -5/11
m = -5/11
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