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t in (-oo:+oo)
1/5 = t/20 // - t/20
1/5-(t/20) = 0
1/5-1/20*t = 0 // - 1/5
-1/20*t = -1/5 // : -1/20
t = -1/5/(-1/20)
t = 4
t = 4
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