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m in (-oo:+oo)
(4/5)*m-(4/5)-(1/5) = 1 // - 1
(4/5)*m-(4/5)-(1/5)-1 = 0
(4/5)*m-4/5-1/5-1 = 0
4/5*m-2 = 0 // + 2
4/5*m = 2 // : 4/5
m = 2/4/5
m = 5/2
m = 5/2
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