Solve for B
\left\{\begin{matrix}B=\frac{J+3L}{S}\text{, }&S\neq 0\\B\in \mathrm{R}\text{, }&J=-3L\text{ and }S=0\end{matrix}\right.
Solve for J
J=BS-3L
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SB-3L=J
Swap sides so that all variable terms are on the left hand side.
SB=J+3L
Add 3L to both sides.
\frac{SB}{S}=\frac{J+3L}{S}
Divide both sides by S.
B=\frac{J+3L}{S}
Dividing by S undoes the multiplication by S.
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