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