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t in (-oo:+oo)
t/(-2.1) = -7.8 // + 7.8
t/(-2.1)+7.8 = 0
7.8-0.47619048*t = 0 // - 7.8
-0.47619048*t = -7.8 // : -0.47619048
t = -7.8/(-0.47619048)
t = 16.37999987
t = 16.37999987
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