Question 557409
Not quite, you're close.
:
{{{(18x^4)/(21x^2)}}} 
Reduce the numerical portion of the fraction, divide numerator & denominator by 3
{{{(6x^4)/(7x^2)}}}
The variable, divide the one with lowest exponent into the one with higher
When you divide you subtract exponents so you have
{{{(6x^(4-2))/(7)}}} = {{{(6x^2)/(7)}}}