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t in (-oo:+oo)
(1/2)*t+4/5 = 3/5 // - 3/5
(1/2)*t+4/5-(3/5) = 0
(1/2)*t+4/5-3/5 = 0
1/2*t+1/5 = 0 // - 1/5
1/2*t = -1/5 // : 1/2
t = -1/5/1/2
t = -2/5
t = -2/5
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