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m in (-oo:+oo)
(6/7)*m-((1/7)*m) = 10 // - 10
(6/7)*m-((1/7)*m)-10 = 0
(6/7)*m+(-1/7)*m-10 = 0
5/7*m-10 = 0 // + 10
5/7*m = 10 // : 5/7
m = 10/5/7
m = 14
m = 14
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