# Use substitution to solve the following system of equations. d + e - f = -3 e = f + d + 7 f = 2e - 6 a. d = 3, e = -4, f = 2 b. d = -4, e = 3, f = 2 c. d = -2, e = 4, f = -5 d. d = -5, e = 4, f = 2

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