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t in (-oo:+oo)
t/1.8 = -2.3 // + 2.3
t/1.8+2.3 = 0
0.55555556*t+2.3 = 0 // - 2.3
0.55555556*t = -2.3 // : 0.55555556
t = -2.3/0.55555556
t = -4.13999997
t = -4.13999997
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