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(2*x)/3-(4/7) = 58/21 // - 58/21
(2*x)/3-(4/7)-(58/21) = 0
(2*x)/3-4/7-58/21 = 0
2/3*x-10/3 = 0 // + 10/3
2/3*x = 10/3 // : 2/3
x = 10/3/2/3
x = 5
x = 5
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