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D( n )
3*n+8 = 0
3*n+8 = 0
3*n+8 = 0
3*n+8 = 0 // - 8
3*n = -8 // : 3
n = -8/3
n in (-oo:-8/3) U (-8/3:+oo)
(n-7)/(3*n+8) = 3/5 // - 3/5
(n-7)/(3*n+8)-(3/5) = 0
(n-7)/(3*n+8)-3/5 = 0
(5*(n-7))/(5*(3*n+8))+(-3*(3*n+8))/(5*(3*n+8)) = 0
5*(n-7)-3*(3*n+8) = 0
-4*n-59 = 0
(-4*n-59)/(5*(3*n+8)) = 0
(-4*n-59)/(5*(3*n+8)) = 0 // * 5*(3*n+8)
-4*n-59 = 0
-4*n-59 = 0 // + 59
-4*n = 59 // : -4
n = 59/(-4)
n = -59/4
n = -59/4
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