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m in (-oo:+oo)
2*m-(2/5) = 7/10 // - 7/10
2*m-(2/5)-(7/10) = 0
2*m-2/5-7/10 = 0
2*m-11/10 = 0 // + 11/10
2*m = 11/10 // : 2
m = 11/10/2
m = 11/20
m = 11/20
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