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(1/2)*x+(8/5)*x = x+13 // - x+13
(1/2)*x+(8/5)*x-x-13 = 0
11/10*x-13 = 0 // + 13
11/10*x = 13 // : 11/10
x = 13/11/10
x = 130/11
x = 130/11
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