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StarstruckMAY
It is answer A. 7u +5v , Just saw that it was unanswered so hopes this helps.
 
wolfsaway

Answer: The answer is 7u + 5v

Step-by-step explanation:

3u + 4u = 7u

7v - 2v = 5v

So, 7u + 5v is the answer.

I hope this helps :)