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