load("disol")$

/* ISOLATE is difficult to use when there is more than
        one variable of interest.  For example, suppose one wished
        to isolate the following expression with respect to A, B, E: */
exp1:a*(b*(c+d)+e*(f+g));
/*  DISOLATE can be used in such situations: */
/* LOAD(DISOL)$ */
disolate(exp1,a,b,e);