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(3*x)/7-(16/21) = x/3 // - x/3
(3*x)/7-(x/3)-(16/21) = 0
(3*x)/7-(x/3)-16/21 = 0
2/21*x-16/21 = 0 // + 16/21
2/21*x = 16/21 // : 2/21
x = 16/21/2/21
x = 8
x = 8
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