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