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D( n )
n-5 = 0
n-5 = 0
n-5 = 0
n-5 = 0 // + 5
n = 5
n in (-oo:5) U (5:+oo)
2/(n-5) = 18/45 // - 18/45
2/(n-5)-(18/45) = 0
2/(n-5)-2/5 = 0
(2*5)/(5*(n-5))+(-2*(n-5))/(5*(n-5)) = 0
2*5-2*(n-5) = 0
20-2*n = 0
(20-2*n)/(5*(n-5)) = 0
(20-2*n)/(5*(n-5)) = 0 // * 5*(n-5)
20-2*n = 0
20-2*n = 0 // - 20
-2*n = -20 // : -2
n = -20/(-2)
n = 10
n = 10
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