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t in (-oo:+oo)
(1/6)*(6*t-6) = t+6/12 // - t+6/12
(1/6)*(6*t-6)-t-(6/12) = 0
(1/6)*(6*t-6)-t-1/2 = 0
1/6*(6*t-6)-t-1/2 = 0
(1/6*2*(6*t-6))/2+(2*(-t))/2-1/2 = 0
1/6*2*(6*t-6)+2*(-t)-1 = 0
-2-1 = 0
-3 = 0
-3/2 = 0
-3/2 = 0 // * 2
-3 = 0
t belongs to the empty set
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