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t in (-oo:+oo)
(9*t)/20-(t/4) = 1 // - 1
(9*t)/20-(t/4)-1 = 0
1/5*t-1 = 0 // + 1
1/5*t = 1 // : 1/5
t = 1/1/5
t = 5
t = 5
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