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m in (-oo:+oo)
6/12 = m/42 // - m/42
6/12-(m/42) = 0
1/2-1/42*m = 0 // - 1/2
-1/42*m = -1/2 // : -1/42
m = -1/2/(-1/42)
m = 21
m = 21
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