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Answer:
x = 1
y = -4
Step-by-step explanation:
y = -x - 3
y + 3 = -x
x = - y - 3
y = -7(-y - 3) + 3
y = 7y + 21 + 3
y = 7y + 24
-6y = 24
y = -4
-4 = -x - 3
-1 = -x
x = 1