Start with $\displaystyle-{63}+{25}\usepackage{cmbright}\Huge\$ . Since $\displaystyle{63}-{25}={38}\usepackage{cmbright}\Huge\$ , and $\displaystyle{63}>{25}\usepackage{cmbright}\Huge\$ , $\displaystyle-{63}+{25}=-{38}\usepackage{cmbright}\Huge\$ .

Next find $\displaystyle-{38}-{17}=-{38}+{\left(-{17}\right)}\usepackage{cmbright}\Huge\$ . Since $\displaystyle{38}+{17}={55}\usepackage{cmbright}\Huge\$ , and both numbers are negative, $\displaystyle-{38}+{\left(-{17}\right)}=-{55}\usepackage{cmbright}\Huge\$ . Finally subtract $\displaystyle-{55}-{\left(-{8}\right)}=-{55}+{8}\usepackage{cmbright}\Huge\$ . Since $\displaystyle{55}-{8}={47}\usepackage{cmbright}\Huge\$ , and $\displaystyle{55}>{8}\usepackage{cmbright}\Huge\$ , the final result is $\displaystyle-{47}\usepackage{cmbright}\Huge\$ .