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t in (-oo:+oo)
(2/3)*t = -1/4 // + -1/4
(2/3)*t-(-1/4) = 0
(2/3)*t+1/4 = 0
2/3*t+1/4 = 0 // - 1/4
2/3*t = -1/4 // : 2/3
t = -1/4/2/3
t = -3/8
t = -3/8
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