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t in (-oo:+oo)
9.8 = t/1.4285 // - t/1.4285
9.8-(t/1.4285) = 0
9.8-0.700035*t = 0
9.8-0.700035*t = 0 // - 9.8
-0.700035*t = -9.8 // : -0.700035
t = -9.8/(-0.700035)
t = 13.99930003
t = 13.99930003
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