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t in (-oo:+oo)
(2/3)*(6*t+12) = 28 // - 28
(2/3)*(6*t+12)-28 = 0
2/3*(6*t+12)-28 = 0
2/3*(6*t+12)-28 = 0
4*t-20 = 0
4*t-20 = 0
4*t-20 = 0 // + 20
4*t = 20 // : 4
t = 20/4
t = 5
t = 5
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