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