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t in (-oo:+oo)
t/4.3-2.8 = 12.3 // - 12.3
t/4.3-12.3-2.8 = 0
0.23255814*t-15.1 = 0 // + 15.1
0.23255814*t = 15.1 // : 0.23255814
t = 15.1/0.23255814
t = 64.92999987
t = 64.92999987
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