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D( n )
n+2 = 0
n+2 = 0
n+2 = 0
n+2 = 0 // - 2
n = -2
n in (-oo:-2) U (-2:+oo)
3/8 = (7*n-10)/(n+2) // - (7*n-10)/(n+2)
3/8-((7*n-10)/(n+2)) = 0
(-1*(7*n-10))/(n+2)+3/8 = 0
(-1*8*(7*n-10))/(8*(n+2))+(3*(n+2))/(8*(n+2)) = 0
3*(n+2)-1*8*(7*n-10) = 0
86-53*n = 0
(86-53*n)/(8*(n+2)) = 0
(86-53*n)/(8*(n+2)) = 0 // * 8*(n+2)
86-53*n = 0
86-53*n = 0 // - 86
-53*n = -86 // : -53
n = -86/(-53)
n = 86/53
n = 86/53
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