Solve the following system of equations with the substitution method:

`{(-15 x -5 y,=,25),(y, =, -3 x -5):}`

Answer: ( , )

Enter your answers as integers or as reduced fractions in the form A/B. If there is no solution, type "DNE" in each blank. If there are an infinite number of solutions, specify their form in the blanks in terms of x.