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m in (-oo:+oo)
(2/5)*m = 7/8 // - 7/8
(2/5)*m-(7/8) = 0
(2/5)*m-7/8 = 0
2/5*m-7/8 = 0 // + 7/8
2/5*m = 7/8 // : 2/5
m = 7/8/2/5
m = 35/16
m = 35/16
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