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