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t in (-oo:+oo)
(1/3)*(t+6) = 28 // - 28
(1/3)*(t+6)-28 = 0
1/3*(t+6)-28 = 0
1/3*(t+6)-28 = 0
1/3*t-26 = 0
1/3*t-26 = 0
1/3*t-26 = 0 // + 26
1/3*t = 26 // : 1/3
t = 26/1/3
t = 78
t = 78
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