Look at the following pictures of Polynomial Division from a textbook.
Also for further explanation, search up 'Polynomial long division' on You Tube
(The video by 'MySecretMathTutor' seems pretty good)
Try this suggested example.
PS. the 1st step is marked with red, the 2d step - with green, the 3d step - with blue colours, then the final step is marked with orange.
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