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m in (-oo:+oo)
6/7 = m/42 // - m/42
6/7-(m/42) = 0
6/7-1/42*m = 0 // - 6/7
-1/42*m = -6/7 // : -1/42
m = -6/7/(-1/42)
m = 36
m = 36
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