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(2/3)*x = 4/7 // - 4/7
(2/3)*x-(4/7) = 0
(2/3)*x-4/7 = 0
2/3*x-4/7 = 0 // + 4/7
2/3*x = 4/7 // : 2/3
x = 4/7/2/3
x = 6/7
x = 6/7
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