Solve the Equation Using the Multiplication Property of Equality $$\frac { 3 } { 4 } x = 21$$

Multiple Choice

Solve the equation using the multiplication property of equality.
- $$\frac { 3 } { 4 } x = 21$$

A) $\left\{ \frac { 63 } { 4 } \right\}$
B) $\left\{ \frac { 81 } { 4 } \right\}$
C) $\left\{ \frac { 87 } { 4 } \right\}$
D) $\{ 28 \}$