81^(x+1)-27^(2x-3)
81^(x+1)=27^(2x-3)
(3^4)^(x+1)=(3^3)^(2x-3)
3^(4(x+1))=3^(3(2x-3))
4(x+1)=3(2x-3)
4x+4=6x-9
2x=13
x=13/2