Ответ:
[tex]2020 - x = 2021[/tex]
[tex] - x = 2021 -2020[/tex]
[tex] - x = 1[/tex]
[tex]x = - 1[/tex]
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Ответ:
[tex]2020 - x = 2021[/tex]
[tex] - x = 2021 -2020[/tex]
[tex] - x = 1[/tex]
[tex]x = - 1[/tex]