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x in (-oo:+oo)
(2/3)*x-8 = (5/3)*x // - (5/3)*x
(2/3)*x-((5/3)*x)-8 = 0
(2/3)*x+(-5/3)*x-8 = 0
-x-8 = 0 // + 8
-x = 8 // * -1
x = -8
x = -8
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