The equation $\displaystyle{5}{{x}}^{{2}}+{7}={x}-{2}-{3}{{x}}^{{2}}\usepackage{cmbright}\Huge\$ can be rewritten in standard form with $\displaystyle{c}={9}\usepackage{cmbright}\Huge\$ . When the equation is rewritten this way, what is the value of a?

The value of $\displaystyle{a}=\usepackage{cmbright}\Huge\$ _____.