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t in (-oo:+oo)
12-((2*t)/3) = (2*t)/3 // - (2*t)/3
12-((2*t)/3)-((2*t)/3) = 0
(-2/3)*t+(-2/3)*t+12 = 0
12-4/3*t = 0 // - 12
-4/3*t = -12 // : -4/3
t = -12/(-4/3)
t = 9
t = 9
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