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