已知向量 $\stackrel{⃑}{a}=\left(1,2\right)$， $\stackrel{⃑}{b}=\left(2,-2\right)$， $\stackrel{⃑}{c}=\left(1,\lambda \right)$．若 $\stackrel{⃑}{c}\parallel \left(2\stackrel{⃑}{a}+\stackrel{⃑}{b}\right)$，则 $\lambda =$________．