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(5/7)*x-((6/7)*x)-2 = -13 // + 13
(5/7)*x-((6/7)*x)-2+13 = 0
(5/7)*x+(-6/7)*x-2+13 = 0
11-1/7*x = 0 // - 11
-1/7*x = -11 // : -1/7
x = -11/(-1/7)
x = 77
x = 77
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