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m in (-oo:+oo)
(3/8)*m = 5/2 // - 5/2
(3/8)*m-(5/2) = 0
(3/8)*m-5/2 = 0
3/8*m-5/2 = 0 // + 5/2
3/8*m = 5/2 // : 3/8
m = 5/2/3/8
m = 20/3
m = 20/3
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