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100

x - 5 = 10

x = 15

100

5y - 2 = 18

y = 4

100

2x + 10 + x

3x + 10

100

y + y + y + 6 = 12

3y + 6 = 12

y = 2

200

r + 6 = 20

r = 14

200

6k + 3 = 33

k = 5

200

2x + 4 + 3x

5x + 4

200

7x + 2x - 5 = 31

9x - 5 = 31

x = 4

300

7f = 49

f = 7

300

9t - 5 = 22

t = 3

300

6x + 8 - 2x

4x + 8

300

2b + 8 + b + 1 = 45

3b + 9 = 45

b = 12

400

b ÷ 3 = 6

b = 18

400

3q + 6 = 21

q = 5

400

4x - 7 + x - 2

5x - 9

400

3t + 2 - t - 5 = 11

2t - 3 = 11

t = 7

500

h - 1.5 = 3.5

h = 5

500

3x + 4.8 = 19.8

x = 5

500

3x + 6 + 2x - 9 - 4x

x - 3

500

4c - 3 + 2c + 1 = 58

6c - 2 = 58

c = 10