Question

Answer 1

a, \(x=-3:\dfrac{3}{4}=-4\)

b, \(\dfrac{7}{8}x=\dfrac{2}{9}-\dfrac{1}{3}=-\dfrac{1}{9}\Leftrightarrow x=-\dfrac{1}{9}:\dfrac{7}{8}=-\dfrac{8}{63}\)

c, \(-\dfrac{4}{21}x=\dfrac{28}{3}.\dfrac{3}{28}=1\Leftrightarrow x=-\dfrac{21}{4}\)

Answer 2

`a)3/4 x + 1 =-2`

`=> 3/4 x=-2-1`

`=> 3/4 x=-3`

`=>x= -3 : 3/4`

`=>x= -3 . 4/3`

`=>x=-4`

`b) 2/9 - 7/8 .x =1/3`

`=>  7/8 .x =2/9-1/3`

`=> 7/8 .x =-1/9`

`=>x =-1/9:7/8`

`=> x =-1/9 . 8/7`

`=>x=-8/63`

`c)`

`(1/7-1/3)x=28/3(1/4-1/7)`

`=> -4/21 x = 28/3.3/28`

`=> -4/21 x =1`

`=>  x =1 : ( -4/21)`

`=>  x =1 . (-21/4)`

`=> x=  (-21/4)`