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t in (-oo:+oo)
11/1.8 = t/9 // - t/9
11/1.8-(t/9) = 0
6.11111111-1/9*t = 0 // - 6.11111111
-1/9*t = -6.11111111 // : -1/9
t = -6.11111111/(-1/9)
t = 55.00000054
t = 55.00000054
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