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m in (-oo:+oo)
10/15 = m/30 // - m/30
10/15-(m/30) = 0
2/3-1/30*m = 0 // - 2/3
-1/30*m = -2/3 // : -1/30
m = -2/3/(-1/30)
m = 20
m = 20
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