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m in (-oo:+oo)
5/8 = m/42 // - m/42
5/8-(m/42) = 0
5/8-1/42*m = 0 // - 5/8
-1/42*m = -5/8 // : -1/42
m = -5/8/(-1/42)
m = 105/4
m = 105/4
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