Hello, sirellwood!

If you don't understand modulo arithmetic,

. . you should not be assigned this problem.

Subtract [2] - [1]: .

We need the multiplicative inverse of

. . It took a while, but I found it: .

Multiply by 245: .

. . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . .

Substitute into [1]: .

. . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .