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x in (-oo:+oo)
(2/3)*x = 4*x+8 // - 4*x+8
(2/3)*x-(4*x)-8 = 0
(2/3)*x-4*x-8 = 0
-10/3*x-8 = 0 // + 8
-10/3*x = 8 // : -10/3
x = 8/(-10/3)
x = -12/5
x = -12/5
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