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(2/3)*x+2/7 = 2*(20/21) // - 2*(20/21)
(2/3)*x+2/7-(2*(20/21)) = 0
(2/3)*x+2/7-40/21 = 0
2/3*x-34/21 = 0 // + 34/21
2/3*x = 34/21 // : 2/3
x = 34/21/2/3
x = 17/7
x = 17/7
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