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m in (-oo:+oo)
(3/7)*m+4/9 = 31/9 // - 31/9
(3/7)*m+4/9-(31/9) = 0
(3/7)*m+4/9-31/9 = 0
3/7*m-3 = 0 // + 3
3/7*m = 3 // : 3/7
m = 3/3/7
m = 7
m = 7
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