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t in (-oo:+oo)
9-(3*t) = 4*t+23 // - 4*t+23
9-(3*t)-(4*t)-23 = 0
9-3*t-4*t-23 = 0
-7*t-14 = 0 // + 14
-7*t = 14 // : -7
t = 14/(-7)
t = -2
t = -2
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