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t in (-oo:+oo)
-t/4.5 = 8.4 // - 8.4
-t/4.5-8.4 = 0
-0.22222222*t-8.4 = 0 // + 8.4
-0.22222222*t = 8.4 // : -0.22222222
t = 8.4/(-0.22222222)
t = -37.80000038
t = -37.80000038
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