What is the 2006 power of minus 3 plus the 2007 power of minus 3?

What is the 2006 power of minus 3 plus the 2007 power of minus 3?

(-3)^2006+(-3)^2007
=3^2006-3^2007
=3^3006-3*3^2006
=-2*3^2006

Minus one-fifth of the 2007 power*(-5) of the 2006 power

=-1/5*(-1/5)^2006*(-5)^2006
=-1/5*(1/5*5)^2006)
=-1/5