Разделим обе части неравенства на 19^x
(\frac{21}{19})^{x}\; ,\; \; (\frac{21}{19})^0>(\frac{21}{19})^{x}\\\\\frac{21}{19}>1\; \; \to \; \; x<0" alt="1>(\frac{21}{19})^{x}\; ,\; \; (\frac{21}{19})^0>(\frac{21}{19})^{x}\\\\\frac{21}{19}>1\; \; \to \; \; x<0" align="absmiddle" class="latex-formula">
Наибольшее целое х=-1