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m in (-oo:+oo)
(2/3)*m = 20/27 // - 20/27
(2/3)*m-(20/27) = 0
(2/3)*m-20/27 = 0
2/3*m-20/27 = 0 // + 20/27
2/3*m = 20/27 // : 2/3
m = 20/27/2/3
m = 10/9
m = 10/9
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