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m in (-oo:+oo)
10*m-(2/5) = 9*(3/5) // - 9*(3/5)
10*m-(2/5)-(9*(3/5)) = 0
10*m-2/5-27/5 = 0
10*m-29/5 = 0 // + 29/5
10*m = 29/5 // : 10
m = 29/5/10
m = 29/50
m = 29/50
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