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(2/13)*x = 1/3 // - 1/3
(2/13)*x-(1/3) = 0
(2/13)*x-1/3 = 0
2/13*x-1/3 = 0 // + 1/3
2/13*x = 1/3 // : 2/13
x = 1/3/2/13
x = 13/6
x = 13/6
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