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x in (-oo:+oo)
166 = (2/3)*x // - (2/3)*x
166-((2/3)*x) = 0
(-2/3)*x+166 = 0
166-2/3*x = 0 // - 166
-2/3*x = -166 // : -2/3
x = -166/(-2/3)
x = 249
x = 249
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