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(5/2)*x-(1/3) = 13 // - 13
(5/2)*x-(1/3)-13 = 0
(5/2)*x-1/3-13 = 0
5/2*x-40/3 = 0 // + 40/3
5/2*x = 40/3 // : 5/2
x = 40/3/5/2
x = 16/3
x = 16/3
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