Nexus 5x 'System' takes up 6GB

Struggling for space on my Nexus 5x and so checked the storage and turns out 'System' takes up 5.7GB of space. I'm running on the Android 8.0 version. Firstly, is it normal for the system to take up so much space?! If not, how do I free it up again??

Any advice will be much appreciated!!

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