instruction:
Translate the given Spanish text to English
question:
Formula (A-) a .
answer:
Formula (A-)a.


question:
A dentifrice having a haze value of less than about 70 may be prepared using this abrasive, amorphous silica.
answer:
Un dentifrico que tiene un valor de nebulosidad menor a aproximadamente 70 que se puede preparar utilizando dicho silice amorfo, abrasivo.


question:
Formula (I) wherein A, T, W, X, n and Z3 to Z7 represent various substituents.
answer:

(ver fórmula (I)) en donde A, T, W, X, n y Z3 a Z7 representan varios sustituyentes.