\[8\frac{7}{9} + 6\frac{2}{15} - 4,3 =\]
\[= 8\frac{7^{\backslash 10}}{9} + 6\frac{2^{\backslash 6}}{15} - 4\frac{3^{\backslash 9}}{10} =\]
\[= 10\frac{70 + 12 - 27}{90} =\]
\[= 10\frac{55}{90} = 10\frac{11}{18}\]