Question

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Answer 1

$x- frac{3}{20} = frac{4}{5} - frac{1}{2} \ x- frac{3}{20} = frac{8-5}{10} \ x- frac{3}{20} = frac{3}{10} \ x= frac{3}{10} + frac{3}{20} \ x= frac{6+3}{20} \ x= frac{9}{20} \ \ frac{5}{6} -( frac{1}{2} - frac{2}{7})= frac{5}{6} -( frac{7-4}{14} )= frac{5}{6} - frac{3}{14} = frac{35-9}{42} = frac{26}{42} = frac{13}{21} \ \ frac{2}{3} -( frac{5}{6} -x)= frac{1}{2} \ frac{2}{3} -frac{5}{6} +x= frac{1}{2} \ x= frac{1}{2} - frac{2}{3} + frac{5}{6}$$x= frac{3-4+5}{6} \ x= frac{4}{6} \ x= frac{2}{3}$

$frac{5}{6} -( frac{1}{2} - frac{2}{7} )= frac{5}{6} - frac{1}{2} + frac{2}{7} = frac{35-21+12}{42} = frac{26}{42} = frac{13}{21}$