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m in (-oo:+oo)
(11/8)*m = 1/2-(15/14) // - 1/2-(15/14)
(11/8)*m-(1/2)+15/14 = 0
(11/8)*m-1/2+15/14 = 0
11/8*m+4/7 = 0 // - 4/7
11/8*m = -4/7 // : 11/8
m = -4/7/11/8
m = -32/77
m = -32/77
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