Answer: D. 23/63x + 1/4
Explanation:
(1/7x + 3/8) + (2/9x - 1/8)
Combine like terms
3/8 + -1/8 = 2/8
Next, combine 2/9x + 1/7x = 23/63x
Therefire, 23/63x + 1/4 is the simplest form
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