(2n/4+n + 16/n²-4n+16 - (n³-20n²))/(n+2)(n²-4n+16))*((n+4)²/n+4 - 12n/n+4):(n+4)=
((2n*(n²-4n+16)+16(n+4)-n³+20n²)/(n+4)(n²-4n+16))*((n+4)²-12n/n+4)):(n+4)=
((2n³-8n²+32n+16n+64-n³+20n²)/(n+4)(n²-4n+16))*((n²+8n+16-12n)/n+4):(n+4)=
((n³+12n²+48n+64)/(n+4)(n²-4n+16))*((n²-4n+16)/n+4):(n+4)=
((n+4)³/(n+4)(n²-4n+16))*(n²-4n+16)/(n+4)²=
(n+4)²/(n+4)=n+4