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m in (-oo:+oo)
(5/7)*m-((6/7)*m)-5 = -13 // + 13
(5/7)*m-((6/7)*m)-5+13 = 0
(5/7)*m+(-6/7)*m-5+13 = 0
8-1/7*m = 0 // - 8
-1/7*m = -8 // : -1/7
m = -8/(-1/7)
m = 56
m = 56
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