2a - a + a, 3b - b + b + b, 3c - 3 x c, d - 5d - 4d, 6e - 6(e + 2) - 12, 2f - 5f - 3f, 6g - g + 2g + 3g, 7h - 6h - 2h + 3h, 5i - 2i + 4i - i,

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