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m in (-oo:+oo)
(4/5)*m+1 = 41/5 // - 41/5
(4/5)*m-(41/5)+1 = 0
(4/5)*m-41/5+1 = 0
4/5*m-36/5 = 0 // + 36/5
4/5*m = 36/5 // : 4/5
m = 36/5/4/5
m = 9
m = 9
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