Add x to both sides: $\displaystyle{1}+{2}{x}={1}\usepackage{cmbright}\Huge\$

Subtract 1 from both sides: $\displaystyle{2}{x}={0}\usepackage{cmbright}\Huge\$

Now if you divide both sides by 2, you will find that the solution is $\displaystyle{x}={0}\usepackage{cmbright}\Huge\$ .