7g + 5g - 4, 7g + 5g, -4, 10b - 3b + 7, 7, 10b - 3b, 8x + 4 - 2x, 8x - 2x, 4, 3e + 4e-5e, 3e + 4e - 5e, 3e + 4e, 20 + 5p - 2p, 20, 5p - 2p, 80 - 4r + 6g - 3r, -4r -3r, 80 + 6g, 91q + 100q - 45, -45, 91q + 100q, 6p - 4r + 10p - 5q, 6p +10p, -4r - 5q, 20i - 13h + 10h - 6p, 20i - 6p, 13h + 10h, 5m + 4x - 6m, 5m - 6m, 4x

Combining like terms.

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