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t in (-oo:+oo)
(1/9)*(6*t-8) = t+8/18 // - t+8/18
(1/9)*(6*t-8)-t-(8/18) = 0
(1/9)*(6*t-8)-t-4/9 = 0
1/9*(6*t-8)-t-4/9 = 0
(1/9*9*(6*t-8))/9+(9*(-t))/9-4/9 = 0
1/9*9*(6*t-8)+9*(-t)-4 = 0
-3*t-8-4 = 0
-3*t-12 = 0
(-3*t-12)/9 = 0
(-3*t-12)/9 = 0 // * 9
-3*t-12 = 0
-3*t-12 = 0 // + 12
-3*t = 12 // : -3
t = 12/(-3)
t = -4
t = -4
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