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m in (-oo:+oo)
4*m-1/5 = 3/5 // - 3/5
4*m-1/5-(3/5) = 0
4*m-1/5-3/5 = 0
4*m-4/5 = 0 // + 4/5
4*m = 4/5 // : 4
m = 4/5/4
m = 1/5
m = 1/5
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