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Mystery
100

 n + 2 = 8 

n = 6

100

12=x - 5

x = 17

100

66=6y

y = 11

100

x/6=12

z = 72

100

What is the inverse of subtraction?

Addition


200

11 = v + 11

v = 0

200

x - 8 = 11

19

200

6d = 30

d = 5

200

6=x/2


x = 12

200

Simplify:  3(x + 7) - 2x

x + 21

300

f + 312 = 725

f = 413

300

34 = x - 40

x = 74

300

 756 = 18c

c = 42

300


y/6=21

y = 126


300

Evaluate when x = 3 and y = -2

2x2 - 3y

24

400

100 = 56 + x

x = 44

400

x - 64=28

x = 92

400

36 = 3r

r =12

400

14=a/2

a = 28

400

What is 4 + 2 x 4?

12

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

500

Simplify 

3 - 8(2x - 5) + 3x

-13x + 43