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m in (-oo:+oo)
m/25 = 10/50 // - 10/50
m/25-(10/50) = 0
m/25-1/5 = 0
1/25*m-1/5 = 0 // + 1/5
1/25*m = 1/5 // : 1/25
m = 1/5/1/25
m = 5
m = 5
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