Solve for a
\left\{\begin{matrix}a=\frac{b}{y}\text{, }&y\neq 0\\a\in \mathrm{R}\text{, }&b=0\text{ and }y=0\end{matrix}\right.
Solve for b
b=ay
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ay=b-\frac{\mathrm{d}}{\mathrm{d}t}(y)
Subtract \frac{\mathrm{d}}{\mathrm{d}t}(y) from both sides.
ya=b
The equation is in standard form.
\frac{ya}{y}=\frac{b}{y}
Divide both sides by y.
a=\frac{b}{y}
Dividing by y undoes the multiplication by y.
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