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x in (-oo:+oo)
2-((1/3)*x) = 8 // - 8
2-((1/3)*x)-8 = 0
(-1/3)*x-8+2 = 0
-1/3*x-6 = 0 // + 6
-1/3*x = 6 // : -1/3
x = 6/(-1/3)
x = -18
x = -18
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