Incorrect. The first step is a valid one, and results in $\displaystyle{x}+\frac{{1}}{{3}}\usepackage{cmbright}\Huge\$ . However, subtracting 4 does not isolate the variable. You would need to perform the inverse of adding $\displaystyle\frac{{1}}{{3}}\usepackage{cmbright}\Huge\$ , which is subtracting $\displaystyle\frac{{1}}{{3}}\usepackage{cmbright}\Huge\$ , to get x by itself. A way to do this without fractions is to add 4 first, and then divide by 12. Adding 4 yields a value of 12x, and dividing by 12 will isolate x completely.