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t in (-oo:+oo)
(3*t)/3+16.5 = 0.9-(t/(-5)) // - 0.9-(t/(-5))
(3*t)/3+t/(-5)-0.9+16.5 = 0
4/5*t+15.6 = 0 // - 15.6
4/5*t = -15.6 // : 4/5
t = -15.6/4/5
t = -19.5
t = -19.5
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