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m in (-oo:+oo)
12/48 = m/20 // - m/20
12/48-(m/20) = 0
1/4-1/20*m = 0 // - 1/4
-1/20*m = -1/4 // : -1/20
m = -1/4/(-1/20)
m = 5
m = 5
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