Номер 525

Краткое условие: 1) \( 8 \frac{2}{15}-(x+3 \frac{5}{14}): 5 \frac{5}{8}=7 \frac{1}{3} \); 2) \( 2 \frac{7}{9}:(3 \frac{3}{4} y-11 \frac{2}{3})+1 \frac{6}{7}=2 \frac{4}{21} \); 3) \( \frac{4}{5} t+\frac{4}{15}+\frac{2}{3} t=1 \); 4) \( 1 \frac{2}{3}+\frac{4}{9} z+2 \frac{1}{3} z=5 \frac{5}{9} \).