$ (19a + 5b + c) - (7a + 3b + c) = 6 - (-4) $
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- $ \Rightarrow 19a + 5b + c = 6 \quad \text{(6)} $
- $ (64a + 16b + 4c + d) - (27a + 9b + 3c + d) = -7 - 5 $
- $ \Rightarrow 37a + 7b + c = -12 \quad \text{(7)} $
- $ \Rightarrow 12a + 2b = 10 \Rightarrow 6a + b = 5 \quad \text{(8)} $
- $ (37a + 7b + c) - (19a + 5b + c) = -12 - 6 $
- $ \Rightarrow 18a + 2b = -18 \Rightarrow 9a + b = -9 \quad \text{(9)} $
