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m in (-oo:+oo)
4/12 = m/30 // - m/30
4/12-(m/30) = 0
1/3-1/30*m = 0 // - 1/3
-1/30*m = -1/3 // : -1/30
m = -1/3/(-1/30)
m = 10
m = 10
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