Subtracting these gives $ 3a = 4 $ → $ a = \frac{4}{3} $. Substituting back, $ b = -4 $. Then, from $ 7a + 3b + c = 7 $, we find $ c = \frac{35}{3} $. Finally, $ d = -6 $. Thus,

Sun, 03 May 2026 22:43:20 +0000

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