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t in (-oo:+oo)
5/243 = t/2 // - t/2
5/243-(t/2) = 0
5/243-1/2*t = 0 // - 5/243
-1/2*t = -5/243 // : -1/2
t = -5/243/(-1/2)
t = 10/243
t = 10/243
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