5x (a)   =50

(a)   x3=6

5x (a)   =35

9x (a)   =63

(a)   x2=18

(a)   x4=16

6x (a)   =54

(a)   x6=30

(a)   x1=9

2x (a)   =20

4x (a)   =20

(a)   x5=15

(a)   x5=10

6x (a)   =48

7x (a)   =35

7x (a)   =21

(a)   x10=40

(a)   x6=24

(a)   x2=8