Alternative Equation Formats

$${\displaystyle \begin{array}{rrrrrrrrrrrr}\text{maximize}& x_{11}& +& 2x_{21}& +& x_{31}& & & +& x_{22}& +& x_{32}\\ \text{subject to}& x_{11}& & & & & +& x_{12}& & & & & \ge <!--\; \ge \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& 1& \text{(m)}\\ & 5x_{11}& +& 7x_{21}& +& 4x_{31}& & & & & & & \le <!--\; \le \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& 11& \text{(s1)}\\ & & & & & & & x_{12}& +& 2x_{22}& +& x_{32}& \le <!--\; \le \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& 2& \text{(s2)}\\ & & & & & & & & & & & x_{ij}& \in <!--\; \in \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& \{0,1\}& i\in <!--\; \in \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>\{1,2,3\},j\in <!--\; \in \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>\{1,2\}\end{array}}$$

$${\displaystyle \begin{array}{rrrrrrrrrrrr}\text{maximize}& x_{11}& +& 2x_{21}& +& x_{31}& & & +& x_{22}& +& x_{32}\\ \text{subject to}& x_{11}& & & & & +& x_{12}& & & & & \ge <!--\; \ge \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& 1& \text{(m)}\\ & 5x_{11}& +& 7x_{21}& +& 4x_{31}& & & & & & & \le <!--\; \le \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& 11& \text{(s1)}\\ & & & & & & & x_{12}& +& 2x_{22}& +& x_{32}& \le <!--\; \le \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& 2& \text{(s2)}\\ & & & & & & & & & & & x_{ij}& \in <!--\; \in \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>& \{0,1\}& i\in <!--\; \in \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>\{1,2,3\},j\in <!--\; \in \; --><span\; class="Comment\_comment\_\_N0+Yl"></span>\{1,2\}\end{array}}$$

\[ \begin{array}{rrrrrrrrrrrrlll} \mbox{maximize} & x_{11} & + & 2 x_{21} & + & x_{31} & & & + & x_{22} & + & x_{32} \\ \mbox{subject to} & x_{11} & & & & & + & x_{12} & & & & & \geq & 1 & \mbox{(m)} \\ & 5 x_{11} & + & 7 x_{21} & + & 4 x_{31} & & & & & & & \leq & 11 & \mbox{(s1)} \\ & & & & & & & x_{12} & + & 2 x_{22} & + & x_{32} & \leq & 2 & \mbox{(s2)} \\ & & & & & & & & & & & x_{ij} & \in & \{ 0,1\} & i \in \{ 1,2,3\} , j \in \{ 1,2\} \\ \end{array} \]