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t in (-oo:+oo)
3/2 = 0.9*t-3 // - 0.9*t-3
3/2-(0.9*t)+3 = 0
3/2-0.9*t+3 = 0
9/2-0.9*t = 0 // - 9/2
-0.9*t = -9/2 // : -0.9
t = -9/2/(-0.9)
t = 5
t = 5
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