Если я правильно понял условие, у нас уравнение 5*z+15*z=840
5z+15z=840
20z=840
z=840/20
z=42
Пошаговое объяснение:
Sorry, I didn't understand anything
Sorry, I didn't understand anything
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Sorry, I didn't understand anything
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Sorry, I didn't understand anything
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Sorry, I didn't understand anything
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5z+15z=840
20z=840
z=840^20
z=42
ответ при значении z 42.
проверка 5*42+15*42=210+630=840, ответ верен