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100

2a + 10 = 16

a = 3

100

2x + 3x - 10 = 15

x = 5

100

5x + 9 = 2x + 12

x = 1

100

3x + 2 - x + 4

2x + 6

200

3 - 10b = 23

b = -2

200

x - 3x +  1 + 5 = 8

x = -1

200

8x - 3 = 6y + 17

x = 10

200

-3x + 4y - 2y + 5x - 10

2x + 2y - 10

300

15x - 20 = 40

x = 4

300

4x + 2 - 7x - 10 = 4

x = -4

300

6x + 5 - 2x = 3x + 26

x = 21

300

3d + 18 = 18 - 3d

d = 0

400

1/2x = 14

x = 28

400

3x + 8 - 2x + x - 18 = 10

x = 10

400

9x - 6 = 5x + 18

x = 6

400

10x - x + 7y + 3x - 12y

12x - 5y

500

-1/2x + 4 = 8

x = -8

500

1/2x + 2 - 5 = 5

x = 16

500

4(3x - 2) = 16

x = 2

500

6x + 2y - 4x + 5x - 7y

7x =5y