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m in (-oo:+oo)
(4/9)*m = 8/3 // - 8/3
(4/9)*m-(8/3) = 0
(4/9)*m-8/3 = 0
4/9*m-8/3 = 0 // + 8/3
4/9*m = 8/3 // : 4/9
m = 8/3/4/9
m = 6
m = 6
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