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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

200

11 = v + 11

v = 0

200

x - 8 = 11

19

200

6d = 30

d = 5

200

6=s/2

s = 12

300

f + 312 = 725

f = 413

300

34 = x - 40

x = 74

300

 756 = 18c

c = 42

300

y/42=3

y = 126


400

100 = 56 + x

x = 44

400

x - 64=28

x = 92

400

36 = 3r

r =12

400

14=a/2

a = 28

500


 475.25 + x= 5

x =  -470.25

500

x - 503=2,253

x = 2,756

500

13x = 543

x = 42

500

r/81=4

r = 324