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m in (-oo:+oo)
(4/5)*m-(1/10) = 3/5 // - 3/5
(4/5)*m-(1/10)-(3/5) = 0
(4/5)*m-1/10-3/5 = 0
4/5*m-7/10 = 0 // + 7/10
4/5*m = 7/10 // : 4/5
m = 7/10/4/5
m = 7/8
m = 7/8
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