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m in (-oo:+oo)
(4/5)*m = 16/10 // - 16/10
(4/5)*m-(16/10) = 0
(4/5)*m-8/5 = 0
4/5*m-8/5 = 0 // + 8/5
4/5*m = 8/5 // : 4/5
m = 8/5/4/5
m = 2
m = 2
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