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t in (-oo:+oo)
t-((8/5)*t)-40 = 0
t+(-8/5)*t-40 = 0
-3/5*t-40 = 0 // + 40
-3/5*t = 40 // : -3/5
t = 40/(-3/5)
t = -200/3
t = -200/3
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