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t in (-oo:+oo)
13.5/4.5 = t/19.5 // - t/19.5
13.5/4.5-(t/19.5) = 0
13.5/4.5-0.05128205*t = 0
3-0.05128205*t = 0 // - 3
-0.05128205*t = -3 // : -0.05128205
t = -3/(-0.05128205)
t = 58.50000146
t = 58.50000146
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