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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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