Front

2(y+4) + 7y, y=16

Back

152

Front

8y + 7x - 2x + 4y, x = 2, y = 7

Back

94

Front

21 -8x - 4 + 9x, x = 2

Back

19

Front

4a – 2b + 5 when a = 2 and b = 3

Back

7

Front

5n - 18 when n = 7

Back

17

Front

14y - 5(3-2y), y = 1

Back

9

Front

6x - 3x + 1 + 5x + 2, x = 8

Back

67

Front

18 - 7(3-x), x = 2

Back

11

Front

10x - 3(2x + 8), x = 6

Back

0

Front

7(y+3) - 2y, y = 3

Back

36