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(2/9)*x-(1/7) = 1/3 // - 1/3
(2/9)*x-(1/7)-(1/3) = 0
(2/9)*x-1/7-1/3 = 0
2/9*x-10/21 = 0 // + 10/21
2/9*x = 10/21 // : 2/9
x = 10/21/2/9
x = 15/7
x = 15/7
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