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(2/7)*x+3 = 67/21 // - 67/21
(2/7)*x-(67/21)+3 = 0
(2/7)*x-67/21+3 = 0
2/7*x-4/21 = 0 // + 4/21
2/7*x = 4/21 // : 2/7
x = 4/21/2/7
x = 2/3
x = 2/3
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