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m in (-oo:+oo)
(3/7)*m+7 = 79/7 // - 79/7
(3/7)*m-(79/7)+7 = 0
(3/7)*m-79/7+7 = 0
3/7*m-30/7 = 0 // + 30/7
3/7*m = 30/7 // : 3/7
m = 30/7/3/7
m = 10
m = 10
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