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m in (-oo:+oo)
(2/5)*m+9 = m+24/5 // - m+24/5
(2/5)*m-m-(24/5)+9 = 0
(2/5)*m-m-24/5+9 = 0
21/5-3/5*m = 0 // - 21/5
-3/5*m = -21/5 // : -3/5
m = -21/5/(-3/5)
m = 7
m = 7
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