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m in (-oo:+oo)
5*m-(1/5) = 23/10 // - 23/10
5*m-(1/5)-(23/10) = 0
5*m-1/5-23/10 = 0
5*m-5/2 = 0 // + 5/2
5*m = 5/2 // : 5
m = 5/2/5
m = 1/2
m = 1/2
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