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t in (-oo:+oo)
t/16 = 400/20 // - 400/20
t/16-(400/20) = 0
t/16-20 = 0
1/16*t-20 = 0 // + 20
1/16*t = 20 // : 1/16
t = 20/1/16
t = 320
t = 320
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