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t in (-oo:+oo)
t-((5/4)*t)-20 = 0
t+(-5/4)*t-20 = 0
-1/4*t-20 = 0 // + 20
-1/4*t = 20 // : -1/4
t = 20/(-1/4)
t = -80
t = -80
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