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What is the variable?
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100

x + 12 = 24

x = 12

100

2(3y + 2)


6y +4

100

5 x 4 = 

20

100

x + 2 = 4

x is the variable 
100

12/4 = 

3

200

x + 5 = 30

x = 25

200

4(3y + 5)

12y + 20

200

3 x 4 = 

12

200

y + 10 = 14

y is the variable

200

18/2 = 

9

300

2 + y = 8

y = 6

300

5(2y + 8)

10y + 40

300

8 x 9 = 

72

300

g + 18 = 91

g is the variable

300

6/3 = 

2

400

y + 24 = 28

y = 4

400

9(y + 2)

9y + 18

400

7 x 3 =

21

400

8 + h = 18

h is the variable 
400

20/5 =

4
500

y - 18 = 22

y = 40 

500

10(y + 5) 

10y + 50

500

2 x 3 =

6

500

9 + a = 18

a is the variable. 

500

15/3 = 

5