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m in (-oo:+oo)
(4*m)/7+9/4 = 99/28 // - 99/28
(4*m)/7+9/4-(99/28) = 0
(4*m)/7+9/4-99/28 = 0
4/7*m-9/7 = 0 // + 9/7
4/7*m = 9/7 // : 4/7
m = 9/7/4/7
m = 9/4
m = 9/4
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