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t in (-oo:+oo)
t+(1/2)*t+5 = 28/5 // - 28/5
t+(1/2)*t-(28/5)+5 = 0
t+(1/2)*t-28/5+5 = 0
3/2*t-3/5 = 0 // + 3/5
3/2*t = 3/5 // : 3/2
t = 3/5/3/2
t = 2/5
t = 2/5
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