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m in (-oo:+oo)
5-((2/5)*m) = 131/25 // - 131/25
5-((2/5)*m)-(131/25) = 0
(-2/5)*m-131/25+5 = 0
-2/5*m-6/25 = 0 // + 6/25
-2/5*m = 6/25 // : -2/5
m = 6/25/(-2/5)
m = -3/5
m = -3/5
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