$${\mathtt{a}} = {\mathtt{c}}{\mathtt{\,-\,}}\left({\frac{{\mathtt{k1}}}{{\mathtt{k2}}}}\right){\mathtt{\,\times\,}}\left({\frac{{{\mathtt{a}}}^{{\mathtt{2}}}}{{\mathtt{s}}}}\right){\mathtt{\,-\,}}{\mathtt{s}}$$
