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x in (-oo:+oo)
(10/3)*x-8 = 21-((2/3)*x) // - 21-((2/3)*x)
(10/3)*x+(2/3)*x-21-8 = 0
4*x-29 = 0 // + 29
4*x = 29 // : 4
x = 29/4
x = 29/4
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