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T in (-oo:+oo)
T/19.5 = 4.5/13.5 // - 4.5/13.5
T/19.5-(4.5/13.5) = 0
T/19.5-0.33333333 = 0
0.05128205*T-0.33333333 = 0 // + 0.33333333
0.05128205*T = 0.33333333 // : 0.05128205
T = 0.33333333/0.05128205
T = 6.5000001
T = 6.5000001
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