Show that $A$ and $B$ have a common eigenvector

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Can someone help me solve this problem, i have a deadline. Let $\operatorname{rank} (AB-BA)$ be less than or equal to $1$. If $A$ or $B$ has an eigenspace of dimension greater than or equal to $2$, I need to show that $A$ and $B$ have a common eigenvector.How?