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t in (-oo:+oo)
8-(5*t) = 23 // - 23
8-(5*t)-23 = 0
8-5*t-23 = 0
-5*t-15 = 0 // + 15
-5*t = 15 // : -5
t = 15/(-5)
t = -3
t = -3
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