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100

x + 7 = 10

x= 3

100

3x = 15

x=5

100

x + 1/4 = 3/4

x=2/4 or 1/2

100

x + 0.5 = 1.2

x=0.7

100

x - 1/2 = 0.5

x=1

200

x - 5 = 11

16

200

x ÷ 4 = 2

8

200

x - 2/3 = 1/3

x=3/3 or 1

200

x - 1.3 = 0.7

x=2.0

200

x + 2.5 = 5 1/2

x=3
300

13 = x + 4

9

300

0.2x = 1.2

x=6

300

(1/3)x = 5

x=15

300

0.4x = 2.4

x=6

300

(3/4)x = 6

x=8

400

x - 2.5 = 6

8.5

400

x ÷ 0.5 = 10

5

400

x ÷ 1/5 = 4

4/5

400

x ÷ 0.25 = 8

x=2

400

x ÷ 3 = 1.5

4.5

500

x + 3 1/2 = 7

3 1/2

500

(2/5)x = 1 1/5

x=3

500

(5/6)x = 10

x=12

500

0.75x = 3

x=4

500

x - 2 1/2 = 3 3/4

x= 6 1/4