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Solve the following system of equations with the substitution method:
`{(x, =, -4 y -6),(-3 x -12 y,=,18):}`
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. `-4 y -6`
`y`