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m in (-oo:+oo)
(5*m)/4+7/5 = 63/20 // - 63/20
(5*m)/4+7/5-(63/20) = 0
(5*m)/4+7/5-63/20 = 0
5/4*m-7/4 = 0 // + 7/4
5/4*m = 7/4 // : 5/4
m = 7/4/5/4
m = 7/5
m = 7/5
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