## Algebra: A Combined Approach (4th Edition)

$reciprocals$.
Given any nonzero number/expression, the reciprocal of that number/expression is 1 over that number/expression. Reciprocal of $\frac{2x}{7}$ = $\frac{1}{\frac{2x}{7}}$. $\frac{1}{\frac{2x}{7}}$ = 1 $\div$ $\frac{2x}{7}$ = 1 $\times$ $\frac{7}{2x}$ = $\frac{7}{2x}$ .