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m in (-oo:+oo)
(4/5)*m = 2/9 // - 2/9
(4/5)*m-(2/9) = 0
(4/5)*m-2/9 = 0
4/5*m-2/9 = 0 // + 2/9
4/5*m = 2/9 // : 4/5
m = 2/9/4/5
m = 5/18
m = 5/18
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