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t in (-oo:+oo)
8*(8/9)*t = -20 // + 20
8*(8/9)*t+20 = 0
64/9*t+20 = 0 // - 20
64/9*t = -20 // : 64/9
t = -20/64/9
t = -45/16
t = -45/16
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