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(2*x)/7 = 1/3 // - 1/3
(2*x)/7-(1/3) = 0
(2*x)/7-1/3 = 0
2/7*x-1/3 = 0 // + 1/3
2/7*x = 1/3 // : 2/7
x = 1/3/2/7
x = 7/6
x = 7/6
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