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t in (-oo:+oo)
4*((1/2)*t-2) = 2*(t-3) // - 2*(t-3)
4*((1/2)*t-2)-(2*(t-3)) = 0
4*((1/2)*t-2)-2*(t-3) = 0
4*(1/2*t-2)-2*(t-3) = 0
4*(1/2*t-2)-2*(t-3) = 0
-2 = 0
-2 = 0
t belongs to the empty set
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