a) x - 2/3 = -5/12

            x =  -5/12 + 2/3

            x = -5/12 + 8/12

            x = 3/12 =  1/4

b) 8/5 : x = -2/3

            x = 8/5 : -2/3

            x = 8/5 . -3/2

            x = -24/10 = -12/5

c) 1 - 3/7 . x = -2/6

         3/7 . x = 1- (-2/6)

         3/7 . x = 1 + 2/6

         3/7 . x = 6/6 + 2/6

         3/7 . x = 8/6

                 x = 8/6 : 3/7

                 x = 8/6 . 7/3 

                 x = 56/18

a) -2/7 + 2/7 : 3/5

= -2/7 + 2/7. 5/3

= -2/7 + 10/21

= -6/21 + 10/21

= 4/21

b) -8/19 + -4/21 - 17/21 + 27/19

= ( -8/19 + 27/19 ) - ( -4/21 - 17/21)

= 1 - (-1)

= 1+ 1

= 2

c) 6/5 . 3/13 - 6/5 . 16/13

= (6/5 - 6/5) - ( 3/13 -16/13 )

= 0 -  ( -1 )

= 0 + 1

= 1

=