Answer:
5x + 7
Explanation:
6x + 9x + 15 - 10x - 8
6x + 9x - 10x + 15 - 8
6x + 9x - 10x + 7
15x - 10x + 7
=> 6x + 15 + 9x - 10x - 8
=> 6x + 9x - 10x + 15 - 8
=> 5x + 7
Hence, correct answer is 5x + 7.
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