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t in (-oo:+oo)
(1/4)*t+1 = 21/4 // - 21/4
(1/4)*t-(21/4)+1 = 0
(1/4)*t-21/4+1 = 0
1/4*t-17/4 = 0 // + 17/4
1/4*t = 17/4 // : 1/4
t = 17/4/1/4
t = 17
t = 17
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