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m in (-oo:+oo)
m/50 = 21/25 // - 21/25
m/50-(21/25) = 0
m/50-21/25 = 0
1/50*m-21/25 = 0 // + 21/25
1/50*m = 21/25 // : 1/50
m = 21/25/1/50
m = 42
m = 42
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