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m in (-oo:+oo)
(2/5)*m = 8/9 // - 8/9
(2/5)*m-(8/9) = 0
(2/5)*m-8/9 = 0
2/5*m-8/9 = 0 // + 8/9
2/5*m = 8/9 // : 2/5
m = 8/9/2/5
m = 20/9
m = 20/9
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