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m in (-oo:+oo)
(20*m)/625 = 2/5 // - 2/5
(20*m)/625-(2/5) = 0
(20*m)/625-2/5 = 0
4/125*m-2/5 = 0 // + 2/5
4/125*m = 2/5 // : 4/125
m = 2/5/4/125
m = 25/2
m = 25/2
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