Question

tìm x

x + 2/5 = -1/3

5/7 - x = -9/21

Answer 1

\(x+\frac{2}{5}=\frac{-1}{3}\)                           \(\frac{5}{7}-x=\frac{-9}{21}\)

\(x=\frac{-1}{3}-\frac{2}{5}\)                            \(x=\frac{5}{7}-\frac{-9}{21}\)

\(x=\frac{-11}{15}\)                                     \(x=\frac{8}{7}\)

Answer 2

x+2/5=-1/3

=>x=-1/3-2/5

=>x=-11/15

5/7-x=-9/21

=>x=5/7-(-9/21)

=>x=8/7