2 x 0 - 0, 2 × 1 - 2, 2 x 2 - 4, 2 × 3 - 6, 2 × 4 = - 8, 2 × 5 - 10, 2 × 6 - 12, 2 × 7 = - 14, 2 × 8 = - 16, 2 × 9 - 18, 2 × 10 = - 20, 2 × 11 - 22, 2 x 12 - 24,

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