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