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