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t in (-oo:+oo)
1-(4*t) = 1/9 // - 1/9
1-(4*t)-(1/9) = 0
1-4*t-1/9 = 0
8/9-4*t = 0 // - 8/9
-4*t = -8/9 // : -4
t = -8/9/(-4)
t = 2/9
t = 2/9
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