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m in (-oo:+oo)
10/8 = m/20 // - m/20
10/8-(m/20) = 0
5/4-1/20*m = 0 // - 5/4
-1/20*m = -5/4 // : -1/20
m = -5/4/(-1/20)
m = 25
m = 25
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