text: find the litteral equation.? y/p-q = y/p+q   i tryed cross multiplying but i still got it wrong. if p and q are both non-zero, the answer is y=0 (by inspection).  if q=0, then y can be any real number, since the equation becomes y/p=y/p.  for a more general answer, cross multiplying gives you y(p+q)=y(p-q).  if y is non-zero, you can divide it out, giving  p+q=p-q  this is only true if -q=q, which only happens when q=0.  so, the only possibilities are the ones given at the beginning of this answer, namely y=0 if q is not zero, and y is any real number if q=0.