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x in (-oo:+oo)
0.5*x+(8/5)*x = x+13 // - x+13
0.5*x+(8/5)*x-x-13 = 0
1.1*x-13 = 0 // + 13
1.1*x = 13 // : 1.1
x = 13/1.1
x = 11.81818182
x = 11.81818182
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