To simplify the expression 7/9h - 4/9h, we can first find a common denominator for the fractions, which is 9h.
When we do this, we get:
(7 - 4)/(9h)
Simplifying the numerator, we have:
3/9h
Then, we can further simplify the fraction by dividing both the numerator and denominator by 3:
1/3h
Therefore, 7/9h - 4/9h simplifies to 1/3h.
7/9h-4/9h
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