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t in (-oo:+oo)
(3/4)*(t+3)*(8*t-4) = 0
3/4*(t+3)*(8*t-4) = 0
( 8*t-4 )
8*t-4 = 0 // + 4
8*t = 4 // : 8
t = 4/8
t = 1/2
( t+3 )
t+3 = 0 // - 3
t = -3
t in { 1/2, -3 }
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