1 2 + 3 = 12 4 + 2 + = 43 0 + 2 = 3

3

4 = 3 + 2

1

5 x = 1 + 2y 3z

4 5

= 1 + 2 3 + 2 3 = 1 + 6 + 4 3 = + 7

6 = + 7

4 6 2

4 + 28 + 6 + 4 + = 4 9 = 30 =30

9

4

= 3 20

3

9

3

20

3 =

11

3

& 5

= 1 22

3+

30

3 =

3

3

22

3+

30

3 =

11

3

, &

=

11

3 ; y =

11

3 ; =

10

3