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t in (-oo:+oo)
3*t+3/8 = 9/8 // - 9/8
3*t+3/8-(9/8) = 0
3*t+3/8-9/8 = 0
3*t-3/4 = 0 // + 3/4
3*t = 3/4 // : 3
t = 3/4/3
t = 1/4
t = 1/4
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