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m in (-oo:+oo)
2/5 = (8*m)/13 // - (8*m)/13
2/5-((8*m)/13) = 0
(-8/13)*m+2/5 = 0
2/5-8/13*m = 0 // - 2/5
-8/13*m = -2/5 // : -8/13
m = -2/5/(-8/13)
m = 13/20
m = 13/20
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