What Is the Overall Standard Free-Energy Change for the Following $\Delta$

What is the overall standard free-energy change for the following two reactions in terms of $\Delta$ G₁ and $\Delta$ G₂?
A + B $\rightarrow$ 2C $\Delta$ G $\begin{array} { l } \circ\\\text { rxn }\end{array}$
= $\Delta$ G₁
C + D $\rightarrow$ E $\Delta$ G $\begin{array} { l } \circ\\\text { rxn }\end{array}$
= $\Delta$ G₂