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