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(5/3)*x+(1/3)*x = 1/3+8/3+13 // - 1/3+8/3+13
(5/3)*x+(1/3)*x-(1/3)-(8/3)-13 = 0
(5/3)*x+(1/3)*x-1/3-8/3-13 = 0
2*x-16 = 0 // + 16
2*x = 16 // : 2
x = 16/2
x = 8
x = 8
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