I’m going to combine like terms first.
5t + t - 12 = 6t - 12
Next we’re going to leave all the constants on one side and the variables on the other. To do this, we’re going to add/subtract the constants on both sides.
-6t - 6t = -12 - 27
-12t = -39
Isolate t
-39/-12 = 3.25
Since we divided the negative out of t, t is now positive.
T = 3.25