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(6/5)*x = 2/7 // - 2/7
(6/5)*x-(2/7) = 0
(6/5)*x-2/7 = 0
6/5*x-2/7 = 0 // + 2/7
6/5*x = 2/7 // : 6/5
x = 2/7/6/5
x = 5/21
x = 5/21
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