$$\left( \begin{array} { l } { a + 1 } \\ { 5 } \end{array} \right) + \left( \begin{array} { l } { 2 } \\ { b - 3 } \end{array} \right) = \left( \begin{array} { l } { 3 } \\ { 8 } \end{array} \right)$$
