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t in (-oo:+oo)
t/19.5 = 12/4 // - 12/4
t/19.5-(12/4) = 0
t/19.5-3 = 0
0.05128205*t-3 = 0 // + 3
0.05128205*t = 3 // : 0.05128205
t = 3/0.05128205
t = 58.50000146
t = 58.50000146
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