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