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t in (-oo:+oo)
9-t-(4*t) = -1 // + 1
1-t-(4*t)+9 = 0
1-t-4*t+9 = 0
10-5*t = 0 // - 10
-5*t = -10 // : -5
t = -10/(-5)
t = 2
t = 2
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