[tex]x-suma \ initiala \\\\ 30\% \ din \ x \to \frac{\not 30}{\not 100}* x= \frac{3}{10}*x \longrightarrow \frac{3x}{10} - cat \ a \ cheltuit \ prima \ zi \\\\ x^{(10} -\frac{3x}{10} = \frac{10x-3x}{10} \to \frac{7x}{10} -restul \\\\\\ \frac{7x}{10}=35 \\\\ x=\frac{10* \not 35}{\not 7} \\\\ x=10*5 \\\\ \boxed{x=50 \ lei } \\\\ \frac{3* \not 50}{\not 10} = 3*5 \to 15 \ lei - a \ cheltuit \ prima \ zi[/tex]
