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