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m in (-oo:+oo)
(4/7)*m+1 = 19/7 // - 19/7
(4/7)*m-(19/7)+1 = 0
(4/7)*m-19/7+1 = 0
4/7*m-12/7 = 0 // + 12/7
4/7*m = 12/7 // : 4/7
m = 12/7/4/7
m = 3
m = 3
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