5z+15z=840
20z=840
z=840:20
z=42
5·42+15·42=840 (это проверка)
210+630=840
840=840
Ответ:z=42
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5z+15z=840
20z=840
z=840:20
z=42
5·42+15·42=840 (это проверка)
210+630=840
840=840
Verified answer
5z+15z=840
20z=840
z=42
Ответ:z=42