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t in (-oo:+oo)
t/4.3 > 5 // - 5
t/4.3-5 > 0
0.23255814*t-5 > 0 // + 5
0.23255814*t > 5 // : 0.23255814
t > 5/0.23255814
t > 21.49999996
t in (21.49999996:+oo)
(21.49999996:+oo)
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