To answer this, you need to isolate t. To do this you're going to want to divide each side by 7 so that it cancels out the 7 being multiplied by the t. It should look something like this.
t • 7 = 63
------ ---- t = 63/7
7 7
Now that you've isolated t, all you have left is to solve the right side of the equation.
63 ÷ 7 = 9
Therefore, t is equal to 9.