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t in (-oo:+oo)
(1/2)*(9*t-9) = t+4/4 // - t+4/4
(1/2)*(9*t-9)-t-(4/4) = 0
(1/2)*(9*t-9)-t-1 = 0
1/2*(9*t-9)-t-1 = 0
1/2*(9*t-9)-t-1 = 0
7/2*t-9/2-1 = 0
7/2*t-11/2 = 0
7/2*t-11/2 = 0
7/2*t-11/2 = 0 // + 11/2
7/2*t = 11/2 // : 7/2
t = 11/2/7/2
t = 11/7
t = 11/7
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