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t in (-oo:+oo)
16/80 = t/10 // - t/10
16/80-(t/10) = 0
1/5-1/10*t = 0 // - 1/5
-1/10*t = -1/5 // : -1/10
t = -1/5/(-1/10)
t = 2
t = 2
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