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m in (-oo:+oo)
4/20 = m/17 // - m/17
4/20-(m/17) = 0
1/5-1/17*m = 0 // - 1/5
-1/17*m = -1/5 // : -1/17
m = -1/5/(-1/17)
m = 17/5
m = 17/5
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