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x in (-oo:+oo)
0.5*x+(8/3)*x = x+26 // - x+26
0.5*x+(8/3)*x-x-26 = 0
2.16666667*x-26 = 0 // + 26
2.16666667*x = 26 // : 2.16666667
x = 26/2.16666667
x = 11.99999998
x = 11.99999998
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