1/(x+5)=1/5-1/25x+1/125x^2-1/625x^3+1/3125x^4-1/15625x^5+1/78125x^6-1/390625x^7+1/1953125x^8-1/9765625x^9+1/48828125x^10...

1/(x-4)=-1/4-1/16x-1/64x^2-1/256x^3-1/1024x^4-1/4096x^5-1/16384x^6-1/65536x^7-1/262144x^8-1/1048576x^9-1/4194304x^10...