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m in (-oo:+oo)
7/15 = m/30 // - m/30
7/15-(m/30) = 0
7/15-1/30*m = 0 // - 7/15
-1/30*m = -7/15 // : -1/30
m = -7/15/(-1/30)
m = 14
m = 14
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