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t in (-oo:+oo)
(4/5)*t-1 = -21/25 // + -21/25
(4/5)*t-(-21/25)-1 = 0
(4/5)*t+21/25-1 = 0
4/5*t-4/25 = 0 // + 4/25
4/5*t = 4/25 // : 4/5
t = 4/25/4/5
t = 1/5
t = 1/5
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