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

$\frac{3}{7}$x = 9 Multiply both sides by reciprocal: $\frac{7}{3}*(\frac{3}{7}$x) = 9*$\frac{7}{3}$ Simplify: x = 21 Check with substitution: $\frac{3}{7}$(21) = 9 9 = 9