7.
设向量\( \overrightarrow{a}=(m,n), \overrightarrow{b}=(s,t)\),定义两个向量\( \overrightarrow{a}, \overrightarrow{b}\)之间的运算“\(⊗\)”为\( \overrightarrow{a}⊗ \overrightarrow{b}=(ms,nt)\),若向量\( \overrightarrow{p}=(1,2), \overrightarrow{p}⊗ \overrightarrow{q}=(-3,-4)\),则向量\( \overrightarrow{q}=\) ______ .