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t in (-oo:+oo)
(4/5)*t+3 = 47/5 // - 47/5
(4/5)*t-(47/5)+3 = 0
(4/5)*t-47/5+3 = 0
4/5*t-32/5 = 0 // + 32/5
4/5*t = 32/5 // : 4/5
t = 32/5/4/5
t = 8
t = 8
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