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t in (-oo:+oo)
(3/4)*(3*t-6) = 9 // - 9
(3/4)*(3*t-6)-9 = 0
3/4*(3*t-6)-9 = 0
3/4*(3*t-6)-9 = 0
9/4*t-27/2 = 0
9/4*t-27/2 = 0
9/4*t-27/2 = 0 // + 27/2
9/4*t = 27/2 // : 9/4
t = 27/2/9/4
t = 6
t = 6
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