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m in (-oo:+oo)
(4/7)*m+6 = 82/7 // - 82/7
(4/7)*m-(82/7)+6 = 0
(4/7)*m-82/7+6 = 0
4/7*m-40/7 = 0 // + 40/7
4/7*m = 40/7 // : 4/7
m = 40/7/4/7
m = 10
m = 10
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