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t in (-oo:+oo)
t-4 = 3*t+20 // - 3*t+20
t-(3*t)-20-4 = 0
t-3*t-20-4 = 0
-2*t-24 = 0 // + 24
-2*t = 24 // : -2
t = 24/(-2)
t = -12
t = -12
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