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x in (-oo:+oo)
0.5*x+(8/3)*x = x+13 // - x+13
0.5*x+(8/3)*x-x-13 = 0
2.16666667*x-13 = 0 // + 13
2.16666667*x = 13 // : 2.16666667
x = 13/2.16666667
x = 5.99999999
x = 5.99999999
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