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t in (-oo:+oo)
(1/3)*(t-3) = 5 // - 5
(1/3)*(t-3)-5 = 0
1/3*(t-3)-5 = 0
1/3*(t-3)-5 = 0
1/3*t-6 = 0
1/3*t-6 = 0
1/3*t-6 = 0 // + 6
1/3*t = 6 // : 1/3
t = 6/1/3
t = 18
t = 18
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