Energy in Chemical Reactions — Role & Overview

Consider the reactions below $$\begin{align} A+B &\rightarrow C+D \quad &\Delta H=5KJ \\ C &\rightarrow E+F \quad &\Delta H=-2KJ \\ G &\rightarrow D \quad &\Delta H = -1 KJ \end{align}$$ What is the $\Delta H$ value of the composite reaction shown below? $$A+B \rightarrow E+F+G$$