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m in (-oo:+oo)
(5/7)*m-((6/7)*m)-2 = 13 // - 13
(5/7)*m-((6/7)*m)-13-2 = 0
(5/7)*m+(-6/7)*m-13-2 = 0
-1/7*m-15 = 0 // + 15
-1/7*m = 15 // : -1/7
m = 15/(-1/7)
m = -105
m = -105
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