Solve the Equation Using Both the Addition and Multiplication Properties $\left\{ - \frac { 21 } { 13 } \right\}$

Multiple Choice

Solve the equation using both the addition and multiplication properties of equality.
--10y + 21 = -3y

A) $\left\{ - \frac { 21 } { 13 } \right\}$
B) $\{ - 3 \}$
C) $\left\{ \frac { 21 } { 13 } \right\}$
D) $\{ 3 \}$