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