Ответ:
20a = 568 + 432
20а= 1000
a=1000:20
a=50
963 - X = 900 - 579
963 - X = 321
x=963-321
x=642
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Ответ:
20a = 568 + 432
20а= 1000
a=1000:20
a=50
963 - X = 900 - 579
963 - X = 321
x=963-321
x=642