Given the present value, coupon rate, face value, and term of a coupon bond, is there any easy way of finding the required rate of return without guessing or using a computer to find it for you?

Here is an example:

I am given that the present value of the bond is $105.35, the coupons are paid annually and are 8%, that the face value is $100.00 and that there are three years left to maturity (with the next payment being one year from now).

I get from this the equation

How do I find k?