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t in (-oo:+oo)
6.4 = -t/4.5 // + -t/4.5
6.4-(-t/4.5) = 0
0.22222222*t+6.4 = 0
0.22222222*t+6.4 = 0 // - 6.4
0.22222222*t = -6.4 // : 0.22222222
t = -6.4/0.22222222
t = -28.80000029
t = -28.80000029
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