Question

Answer 1

a: \(x=\dfrac{5}{8}+\dfrac{3}{7}=\dfrac{35+24}{56}=\dfrac{59}{56}\)

b: \(\Leftrightarrow x\cdot\dfrac{3}{7}=\dfrac{5}{7}-\dfrac{4}{21}=\dfrac{15-4}{21}=\dfrac{11}{21}\)

hay x=11/21:3/7=11/9

Answer 2

\(-\dfrac{3}{7}+x=\dfrac{5}{8}\)

          \(x=\dfrac{5}{8}+\dfrac{3}{7}=\dfrac{59}{56}\)

\(\dfrac{5}{7}-\dfrac{3}{7}x=\dfrac{4}{21}\)

        \(\dfrac{3}{7}x=\dfrac{5}{7}-\dfrac{4}{21}=\dfrac{11}{21}\)

           \(x=\dfrac{11}{21}.\dfrac{7}{3}=\dfrac{11}{9}\)