Question

Giúp mìn với mn

Answer 1

`c)-x-2/3=-6/7`

`=>-x=-6/7+2/3`

`=>-x=-4/21`

`=>x=4/21`

Answer 2

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

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

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

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

Answer 3

<=> -x = - 6/7 + 2/3 

<=> - x = - 4/21

<=> x = 4/21