we start off by multiplying 2x/5b by the reciprocal of 4x^3/15bx, which is 15bx/4x^3 2x/5b • 15bx/4x^3 so now we cross simplify and we are left with: 3x/2x^2 and we can simplify that fraction into 3/2x. that's as simplified as it can get (: hope that helped!! xx