Respuesta :

Answer:

1. 8x+10

2. -5x-5

3. 2x-20

Step-by-step 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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