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