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t in (-oo:+oo)
(1/4)*(t-2)*(t-7)*(t-9) = 0
1/4*(t-2)*(t-7)*(t-9) = 0
( t-2 )
t-2 = 0 // + 2
t = 2
( t-7 )
t-7 = 0 // + 7
t = 7
( t-9 )
t-9 = 0 // + 9
t = 9
t in { 2, 7, 9 }
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