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t in (-oo:+oo)
1/9-3*t = 65/99 // - 65/99
1/9-3*t-(65/99) = 0
1/9-3*t-65/99 = 0
-3*t-6/11 = 0 // + 6/11
-3*t = 6/11 // : -3
t = 6/11/(-3)
t = -2/11
t = -2/11
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