Answer:
D) n+ 4 = 9
Explanation:
A. 9-n=13
= -n =13-9
-n =13-9 = -n =4
= n = -4
Choice A is incorrect
C. 2n =7
2n/2=7/2
n = 3.5
Choice C is incorrect
D. n +4=9
n =9-4
n = 5
Choice D is correct
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