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t in (-oo:+oo)
3*t-(21/2) = t-6 // - t-6
3*t-t-(21/2)+6 = 0
3*t-t-21/2+6 = 0
2*t-9/2 = 0 // + 9/2
2*t = 9/2 // : 2
t = 9/2/2
t = 9/4
t = 9/4
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