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m in (-oo:+oo)
2/5 = (5/8)*m // - (5/8)*m
2/5-((5/8)*m) = 0
(-5/8)*m+2/5 = 0
2/5-5/8*m = 0 // - 2/5
-5/8*m = -2/5 // : -5/8
m = -2/5/(-5/8)
m = 16/25
m = 16/25
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