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t in (-oo:+oo)
(1/6)*(6*t-9) = t+9/12 // - t+9/12
(1/6)*(6*t-9)-t-(9/12) = 0
(1/6)*(6*t-9)-t-3/4 = 0
1/6*(6*t-9)-t-3/4 = 0
(1/6*4*(6*t-9))/4+(4*(-t))/4-3/4 = 0
1/6*4*(6*t-9)+4*(-t)-3 = 0
-6-3 = 0
-9 = 0
-9/4 = 0
-9/4 = 0 // * 4
-9 = 0
t belongs to the empty set
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