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t in (-oo:+oo)
4*t+1/8 = 69/40 // - 69/40
4*t+1/8-(69/40) = 0
4*t+1/8-69/40 = 0
4*t-8/5 = 0 // + 8/5
4*t = 8/5 // : 4
t = 8/5/4
t = 2/5
t = 2/5
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