TeX source:
\begin{array}{rcl}\alpha + \beta + \gamma &=& 5^\circ +5^\circ +0{,}1\pi \\\alpha + \beta + \gamma &=& 5^\circ +5^\circ +18^\circ \\\alpha + \beta + \gamma &=& 28^\circ \\\alpha + \beta + \gamma & < & 360^\circ \\\end{array}