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t in (-oo:+oo)
9-2*t = 4*t-27 // - 4*t-27
9-2*t-(4*t)+27 = 0
9-2*t-4*t+27 = 0
36-6*t = 0 // - 36
-6*t = -36 // : -6
t = -36/(-6)
t = 6
t = 6
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