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Joakim Danielson · Answer 1 · 2020-06-21T04:35:23+0000

Answer:

3x+9

Explanation:

Remember that like terms can combine. 7x and -4x are like terms, and they combine to get 3x. 12 and -3 are like terms, and they combine to get 9. Therefore, the simplified expression is 3x+9.

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