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m in (-oo:+oo)
(5/12)*m = 1/6-(15/14) // - 1/6-(15/14)
(5/12)*m-(1/6)+15/14 = 0
(5/12)*m-1/6+15/14 = 0
5/12*m+19/21 = 0 // - 19/21
5/12*m = -19/21 // : 5/12
m = -19/21/5/12
m = -76/35
m = -76/35
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