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(2/3)*x-1 = 2/7 // - 2/7
(2/3)*x-(2/7)-1 = 0
(2/3)*x-2/7-1 = 0
2/3*x-9/7 = 0 // + 9/7
2/3*x = 9/7 // : 2/3
x = 9/7/2/3
x = 27/14
x = 27/14
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