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