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t in (-oo:+oo)
(-1/2)*t-t-(2/9) = -85/18 // + -85/18
(-1/2)*t-t-(2/9)-(-85/18) = 0
(-1/2)*t-t-2/9+85/18 = 0
9/2-3/2*t = 0 // - 9/2
-3/2*t = -9/2 // : -3/2
t = -9/2/(-3/2)
t = 3
t = 3
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