b)
x=\frac{7}{8}-1\frac{5}{6}+\frac{7}{15}:(-\frac{3}{5})=\frac{7}{8}-\frac{11}{6}-\frac{7}{15}*\frac{5}{3}=\frac{21-44}{24}-\frac{7}{3}*\frac{1}{3}=
=\frac{-23}{24}-\frac{7}{9}=\frac{-69-56}{72}=-\frac{125}{216}=-1\frac{53}{72}
c)
x=[15\frac{2}{3}-(-7,5)]:\frac{3}{2}=(15\frac{2}{3}+7\frac{1}{2}):\frac{3}{2}=(15\frac{4}{6}+7\frac{3}{6}):\frac{3}{2}=22\frac{7}{6}:\frac{3}{2}=
=\frac{139}{6}*\frac{2}{3}=\frac{139}{9}=15\frac{4}{9}
d)
x=2\frac{1}{3}(\frac{7}{8}+1\frac{1}{2}-0,75)=\frac{7}{3}(0,875+1,5-0,75)=\frac{7}{3}*1,625=
\frac{7}{3}*1\frac{625}{1000}=\frac{7}{3}*1\frac{1}{8}=\frac{7}{3}*\frac{13}{8}=\frac{91}{24}=3\frac{19}{24}