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m in (-oo:+oo)
m/20 = 2500/50 // - 2500/50
m/20-(2500/50) = 0
m/20-50 = 0
1/20*m-50 = 0 // + 50
1/20*m = 50 // : 1/20
m = 50/1/20
m = 1000
m = 1000
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