Dear Lenka,
We don’t use ‘the’, when we use the word ‘left’ or ‘right’ as an adverb. As for example I don’t need to use ‘the’ in the sentence “The pole is leaning left a bit”. But we use ‘the’ with ‘left’ and ‘right’, when they are used as nouns, as in the sentence “The house is on the left/right”
So, I hope that’s clear – thanks for your question.

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