Question

t-1=1

Answer 1

t = 2

Answer 2

Yes, if you think about it.
If you want to make sure, plug it in.
(2) - 1 =1.
Well, that was 1st grade math. :3

Or if you want to think it as an equation, you would want to do reverse order of operation to find x.
So we must get rid of -1.
The opposite of subtraction is addition.
So -1 + 1 = 0 (cancel out)
1 + 1 = 2

Now you have t = 2. :)