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t in (-oo:+oo)
4*t+5 = 7*t+20 // - 7*t+20
4*t-(7*t)-20+5 = 0
4*t-7*t-20+5 = 0
-3*t-15 = 0 // + 15
-3*t = 15 // : -3
t = 15/(-3)
t = -5
t = -5
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