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m in (-oo:+oo)
(7/8)*m = 1/3 // - 1/3
(7/8)*m-(1/3) = 0
(7/8)*m-1/3 = 0
7/8*m-1/3 = 0 // + 1/3
7/8*m = 1/3 // : 7/8
m = 1/3/7/8
m = 8/21
m = 8/21
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