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(3*x)/5+(5*x)/2 = 13 // - 13
(3*x)/5+(5*x)/2-13 = 0
31/10*x-13 = 0 // + 13
31/10*x = 13 // : 31/10
x = 13/31/10
x = 130/31
x = 130/31
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