It is easy to see that if we want to solve this problem, we will consider the convolution
. And in (
28), there are 14 unknowns, and we also need to find their solutions. Next, we will find the expression for
. In the present work, we obtain
where
is defined by (
26). After some calculations as work [
4], we can obtain
, which has following form:
After some calculation, we have
where
Then, taking Equation (
21) into account, we obtain
where
, and
are unknowns. We can construct a system of linear equations which include 21 equations and 21 unknowns by this equation and (
22)–(
24). The system of linear equations has the following form:
where