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100

x+3=9

x=6

100

5x + 5 = 10

x = 1

100

y = 2x + 3 + 2x 

y = 4x + 3

100

-1 + 2 = x

x = 1

100

x + 4 = 2x - 3 

x = 7

200

x - 9 = 12

x = 21

200

4x - 1 = 15

x=4

200

y = 3x - 2x + 17 + 1

y = x + 18

200

-8 - 4 = x

x = -12

200

3x - 2 = -2x + 8

x = 2

300

12 = 2x

x = 6

300

3 + 10x = 43

x = 4

300

y = 5x - 12x - 12

y = -7x - 12

300

12 + 2 - 4 = x

x = 10

300

7x - 18 = x + 6 

x = 4

400

-5x = 45

x=-9

400

-x + 7 = 10

x = -3

400

y= 3 + 3 - 3x - 3x

y = -6x + 6

400

-3 - 3 - 2 + 3 = x

x = -5

400

-x + 3 = x + 19

x = -8

500

x/-4 = 3

x=-12

500

-2x - 3 = -13

x = 5

500

y = -4x + 2 + 4x -2 

y = 0

500

5 + 10 - - 3 = x

x = 18

500

2 - 9x = -8x + 2

x = 0