Since there is no expression given, there is no sensible answer.
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2
In this case N is variable for a math sentence. If the equation is n+7=9 n would equal 2.
4
The Answers community requires more information for this question. Please edit your question to include more context. What is the value of WHICH expression?
5x = 5 times 9, 2y = 2 times 4 so 45 - 8 ie 37