Question

Help me

Answer 1

-x-\(\dfrac{2}{3}=-\dfrac{6}{7}\)

-x=\(-\dfrac{6}{7}+\dfrac{2}{3}\)

-x=\(-\dfrac{4}{21}\)

=>x=\(\dfrac{4}{21}\)

Vậy x bằng \(\dfrac{4}{21}\)