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3*x-(20/561) = 6 // - 6
3*x-(20/561)-6 = 0
3*x-20/561-6 = 0
3*x-3386/561 = 0 // + 3386/561
3*x = 3386/561 // : 3
x = 3386/561/3
x = 3386/1683
x = 3386/1683
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