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DAU PUNCTE + COROANA cls 6
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[tex] \frac{5 \times 9 {}^{73} + 5 \times 9 {}^{73} }{10 \times 9 {}^{71} } = \frac{9x}{15} [/tex]


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[tex]\frac{5 \cdot 9^{73}+5 \cdot 9^{73}}{10 \cdot 9^{71}}=\frac{9x}{15}\\
\\ \frac{9^{73}(5+5)}{10 \cdot 9^{71}}=\frac{9x}{15}\\
\\ \frac{9^{73}\cdot 10}{10 \cdot 9^{71}}=\frac{9x}{15}\\
\\ \frac{9^{2} \cdot 9^{71}\cdot 10}{9^{71}\cdot 10}=\frac{9x}{15}\\
\\ 9^{2}=\frac{9x}{15}\\
\\ 81\cdot 15=9x \\
\\ 1215=9x \\
\\ \Rightarrow x=1215:9\\
\\ \boxed{x=135}[/tex]