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t in (-oo:+oo)
(1/4)*t+1 = 9/4 // - 9/4
(1/4)*t-(9/4)+1 = 0
(1/4)*t-9/4+1 = 0
1/4*t-5/4 = 0 // + 5/4
1/4*t = 5/4 // : 1/4
t = 5/4/1/4
t = 5
t = 5
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