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t in (-oo:+oo)
1/2 = (t-3)/9 // - (t-3)/9
1/2-((t-3)/9) = 0
(-1*(t-3))/9+1/2 = 0
(-1*2*(t-3))/(2*9)+(1*9)/(2*9) = 0
1*9-1*2*(t-3) = 0
15-2*t = 0
(15-2*t)/(2*9) = 0
(15-2*t)/(2*9) = 0 // * 2*9
15-2*t = 0
15-2*t = 0 // - 15
-2*t = -15 // : -2
t = -15/(-2)
t = 15/2
t = 15/2
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