If the sum of the solutions of the equations {3x + 2Y = 4k-36x + 7Y = 8-5k} is - 1, find the value of K and solve the equations

If the sum of the solutions of the equations {3x + 2Y = 4k-36x + 7Y = 8-5k} is - 1, find the value of K and solve the equations

What is the meaning of "the solution of X, the sum of D is - 1"?