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In page Nadezhda von Meck:

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They continued writing even as his marriage followed its brief though tortuous course. As their relationship developed, she subsequently provided him with an allowance of 6,000 rubles a year, large enough that he could leave his professorship at the Moscow Conservatory to focus on creative work full-time. This was a substantial income. A minor government official in those days had to support his family on 300–400 rubles a year.[citation needed]