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(2/3)*x+(6/7)*x+4/7 = 260/231 // - 260/231
(2/3)*x+(6/7)*x+4/7-(260/231) = 0
(2/3)*x+(6/7)*x+4/7-260/231 = 0
32/21*x-128/231 = 0 // + 128/231
32/21*x = 128/231 // : 32/21
x = 128/231/32/21
x = 4/11
x = 4/11
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