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t in (-oo:+oo)
(3/5)*t+7 = 8 // - 8
(3/5)*t-8+7 = 0
3/5*t-1 = 0 // + 1
3/5*t = 1 // : 3/5
t = 1/3/5
t = 5/3
t = 5/3
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