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t in (-oo:+oo)
(-2/3)*t+9 = 7*t-(226/3) // - 7*t-(226/3)
(-2/3)*t-(7*t)+226/3+9 = 0
(-2/3)*t-7*t+226/3+9 = 0
253/3-23/3*t = 0 // - 253/3
-23/3*t = -253/3 // : -23/3
t = -253/3/(-23/3)
t = 11
t = 11
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