A general fraction is to convert several fractions with different denominators into fractions with the same mother number. Simplification is to convert a fraction into a fraction equal to it, but the numerator and denominator are relatively small.
So the general divisor is to divide the numerator and denominator by the same number at the same time, and then get a score equal to the original score but smaller in numerator and denominator.
A general fraction is to multiply the denominator of a molecule by the same number at the same time, and then get a molecule equal to the original fraction.