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x in (-oo:+oo)
2/3 = (1/6)*x // - (1/6)*x
2/3-((1/6)*x) = 0
(-1/6)*x+2/3 = 0
2/3-1/6*x = 0 // - 2/3
-1/6*x = -2/3 // : -1/6
x = -2/3/(-1/6)
x = 4
x = 4
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