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m in (-oo:+oo)
4/5 = m+2/5 // - m+2/5
4/5-m-(2/5) = 0
4/5-m-2/5 = 0
2/5-m = 0 // - 2/5
-m = -2/5 // * -1
m = 2/5
m = 2/5
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