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x in (-oo:+oo)
(1/3)*x-8 = (2/3)*x+4 // - (2/3)*x+4
(1/3)*x-((2/3)*x)-8-4 = 0
(1/3)*x+(-2/3)*x-8-4 = 0
-1/3*x-12 = 0 // + 12
-1/3*x = 12 // : -1/3
x = 12/(-1/3)
x = -36
x = -36
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