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t in (-oo:+oo)
3*t+1/4 = 85/4 // - 85/4
3*t+1/4-(85/4) = 0
3*t+1/4-85/4 = 0
3*t-21 = 0 // + 21
3*t = 21 // : 3
t = 21/3
t = 7
t = 7
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