Question 98250
N=21/10=1/N
N-1/N=21/10
(N^2-1)/N=21/10 CROSS MULTIPLY
10N^2-10=21N
10N^-21N-10=0
(5N+2)(2N-5)=0
5N+2=0
5N=-2
N=-2/5
2N-5=0
2N=5
N=5/2 ANSWER.
PROOF
5/2=21/10+1/5/2
5/2=21/10+2/5
5/2=(21+2+2)/10
5/2=25/10
5/2=5/2