2x (a)   =16

(a)   x2=6

(a)   x8=80

2x (a)   =12

5x (a)   =15

6x (a)   =48

(a)   x8=24

(a)   x9=63

(a)   x8=16

(a)   x4=20

(a)   x5=45

8x (a)   =32

(a)   x9=45

3x (a)   =9

2x (a)   =20

(a)   x9=81

10x (a)   =100

9x (a)   =54

(a)   x6=18