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(4/13)*x = 1/3 // - 1/3
(4/13)*x-(1/3) = 0
(4/13)*x-1/3 = 0
4/13*x-1/3 = 0 // + 1/3
4/13*x = 1/3 // : 4/13
x = 1/3/4/13
x = 13/12
x = 13/12
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