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(2/3)*x-(8/9) = (4/7)*x-(604/693) // - (4/7)*x-(604/693)
(2/3)*x-((4/7)*x)-(8/9)+604/693 = 0
(2/3)*x+(-4/7)*x-8/9+604/693 = 0
2/21*x-4/231 = 0 // + 4/231
2/21*x = 4/231 // : 2/21
x = 4/231/2/21
x = 2/11
x = 2/11
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