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(3*x)/5-5 = 13-(3*x) // - 13-(3*x)
(3*x)/5+3*x-13-5 = 0
18/5*x-18 = 0 // + 18
18/5*x = 18 // : 18/5
x = 18/18/5
x = 5
x = 5
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