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m in (-oo:+oo)
16/20 = m/30 // - m/30
16/20-(m/30) = 0
4/5-1/30*m = 0 // - 4/5
-1/30*m = -4/5 // : -1/30
m = -4/5/(-1/30)
m = 24
m = 24
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