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m in (-oo:+oo)
(4/7)*m+9 = 99/7 // - 99/7
(4/7)*m-(99/7)+9 = 0
(4/7)*m-99/7+9 = 0
4/7*m-36/7 = 0 // + 36/7
4/7*m = 36/7 // : 4/7
m = 36/7/4/7
m = 9
m = 9
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