6х+3=21
6х=21-3
6х=18
Х=18÷6
Х=3
-------
Проверим:
6*3+3=21
18+3=21
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Verified answer
6х+3=21
6х=21-3
6х=18
Х=18÷6
Х=3
-------
Проверим:
6*3+3=21
18+3=21