TeX source:

\mathop \sum \limits_{{\left( {a,b} \right) \in E_{m} }} \mathop \sum \limits_{j \in J} w_{ab}^{jm} - \mathop \sum \limits_{{\left( {b,c} \right) \in E_{m} }} \mathop \sum \limits_{j \in J} w_{bc}^{jm} \le {\text{By}}_{b} \quad \forall b \in V_{\text{two}} ,m \in M