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(2/7)*x-(5/6) = (-2/3)*x-(85/294) // - (-2/3)*x-(85/294)
(2/7)*x-((-2/3)*x)-(5/6)+85/294 = 0
(2/7)*x+(2/3)*x-5/6+85/294 = 0
20/21*x-80/147 = 0 // + 80/147
20/21*x = 80/147 // : 20/21
x = 80/147/20/21
x = 4/7
x = 4/7
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