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x in (-oo:+oo)
(2/3)*x-((1/3)*x) = 8 // - 8
(2/3)*x-((1/3)*x)-8 = 0
(2/3)*x+(-1/3)*x-8 = 0
1/3*x-8 = 0 // + 8
1/3*x = 8 // : 1/3
x = 8/1/3
x = 24
x = 24
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