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(2/3)*x+2/7 = 20/21+2 // - 20/21+2
(2/3)*x+2/7-(20/21)-2 = 0
(2/3)*x+2/7-20/21-2 = 0
2/3*x-8/3 = 0 // + 8/3
2/3*x = 8/3 // : 2/3
x = 8/3/2/3
x = 4
x = 4
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