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100

 n + 2 = 8 

n = 6

100

12= x - 5

x = 17

100

66=6y

y = 11

100

z/6 =12

z = 72

100

4x=16

x = 4


200

11 = v + 3

v = 8

200

x - 8 = 11

19

200

6d = 30

d = 5

200

6=s/2

s = 12

200

x-3=13

x = 16

300

f + 312 = 725

f = 413

300

34 = x - 40

x = 74

300

108 = 18c

c = 6

300

y/42=3

y = 126


300

10x=50

x = 5

400

100 = 56 + x

x = 44

400

x - 64=28

x = 92

400

36 = 2/r

r =54

400

14=a/2

a = 28

400

1/x = 8

x = 16

500

1/3 + x= 5

x = 4 2/3

500

x - 503=253

x = 756

500

1/12 x = 13

x = 156

500

r/81=4

r = 324

500

1/4x=24

x = 96

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