Problem D.10
According to the definition of equality for complex numbers, two complex numbers $z_1 = x_1 + y_1i$ and
$z_2 = x_2 + y_2i$ are equal, $z_1 = z_2$, if their real parts are equal, $Re(z_1) = Re(z_2)$, and their imaginary parts
are equal, $Im(z_1) = Im(z_2)$.
Use the previous definition to find a complex number z that satisfies the given equation.
D.10.a $2z = i(2 + 9i)$