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t in (-oo:+oo)
9.8 = t/1.564 // - t/1.564
9.8-(t/1.564) = 0
9.8-0.63938619*t = 0
9.8-0.63938619*t = 0 // - 9.8
-0.63938619*t = -9.8 // : -0.63938619
t = -9.8/(-0.63938619)
t = 15.32719998
t = 15.32719998
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