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m in (-oo:+oo)
(4*m)/5+5/4 = 53/20 // - 53/20
(4*m)/5+5/4-(53/20) = 0
(4*m)/5+5/4-53/20 = 0
4/5*m-7/5 = 0 // + 7/5
4/5*m = 7/5 // : 4/5
m = 7/5/4/5
m = 7/4
m = 7/4
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