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m in (-oo:+oo)
(3/14)/12 = m/21 // - m/21
(3/14)/12-(m/21) = 0
1/56-1/21*m = 0 // - 1/56
-1/21*m = -1/56 // : -1/21
m = -1/56/(-1/21)
m = 3/8
m = 3/8
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