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t in (-oo:+oo)
8.7 = 19.8/3-(4*t) // - 19.8/3-(4*t)
4*t-(19.8/3)+8.7 = 0
4*t-6.6+8.7 = 0
4*t+2.1 = 0 // - 2.1
4*t = -2.1 // : 4
t = -2.1/4
t = -0.525
t = -0.525
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