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Solve the following system of equations with the substitution method:

`{(5 x + 10 y,=,-40),(x, =, -2 y -8):}`

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 y.