$$\delta_{2}=3y(x+i)+\underline{5x}$$
$S_{2}=x+\left(3+3i\right)y$
$$S_{2}=\left(3+3i\right)y+\frac{5x}{5}$$
$$S_{2}=\left(3+3i\right)y+x$$
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$x=\left(-3-3i\right)y+S_{2}$
$$\left(3+3i\right)y+x=S_{2}$$
$$x=S_{2}-\left(3+3i\right)y$$
$$x=S_{2}+\left(-3-3i\right)y$$
