Answer:
1. 8x+10
2. -5x-5
3. 2x-20
Explanation:
1. Combine like terms, 12x-4x = 8x, 3+7 = 10
2. Combine like terms. -7x+2x=-5x, 8-13 = -5
3. combine like terms, -3x+5x = 2x, -18-2 = -20
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