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m in (-oo:+oo)
(2*m)/9+7/2 = 77/18 // - 77/18
(2*m)/9+7/2-(77/18) = 0
(2*m)/9+7/2-77/18 = 0
2/9*m-7/9 = 0 // + 7/9
2/9*m = 7/9 // : 2/9
m = 7/9/2/9
m = 7/2
m = 7/2
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