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x in (-oo:+oo)
(8/3)*x+0 = x+13 // - x+13
(8/3)*x-x-13+0 = 0
(8/3)*x-x-13 = 0
5/3*x-13 = 0 // + 13
5/3*x = 13 // : 5/3
x = 13/5/3
x = 39/5
x = 39/5
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