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Лови
$( 4 \frac{2}{3} + \frac{7}{9} )+( \frac{1}{6} + 7)=( \frac{4*2}{3} + \frac{7}{9} )+ \frac{1+42}{6}=(\frac{8}{3}+\frac{7}{9})+\frac{43}{6}=\frac{43}{6}+\frac{24+7}{9}=\frac{31}{9}+\frac{43}{6}=\frac{62+129}{18}=\frac{191}{18}$

$(5\frac{3}{14}-3\frac{1}{2})+(1\frac{5}{28}-\frac{3}{7})=(\frac{5}{28}-\frac{3}{7})+(\frac{5*3}{14}-\frac{3*1}{2})=\frac{5-12}{28}+(\frac{5*3}{14}-\frac{3}{2})=\frac{15-21}{14}+\frac{-7}{28}=-\frac{1}{4}+\frac{-3}{7}=-\frac{1}{4}-\frac{3}{7}=\frac{-7-12}{28}=\frac{-19}{28}=-\frac{19}{28}$