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t in (-oo:+oo)
((9/6)*t-7)^2 = 0
(3/2*t-7)^2 = 0
3/2*t-7 = 0 // + 7
3/2*t = 7 // : 3/2
t = 7/3/2
t = 14/3
t in { 14/3, 14/3 }
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