First, let's isolate t! Make sure to change your signs when you change from one side of the equation to the other.
3/2 + t = 1/2
t = 1/2 - 3/2
Now, we can solve for t!
t = 1/2 - 3/2
t = -2/2
t = -1
Hope this helps!
Message me if you have any questions :)