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Addition
Subtraction
Multiplication
Division
Mystery
100

x + 14 = 25

What is 11

100

x - 5 = 7

What is 12

100

9x = -27

What is -3

100

y/6 = 3

What is 18

100

m + 3.7 = 12.4

What is 8.7

200

a + 13 = 10

What is -3

200

d - 7 = -5

What is 2

200

-7c = -42

What is 6

200

x/4 = -10

What is -40

200

-18 = -3x 

x = 6 
300

n -  8 = -14

What is -6

300

k - 30 = -5

What is 25

300

-40  =  8e

What is -5

300

6  =  x/-6

What is -36

300

x/5 = -25

x = -125

400

a + 36 = -100

What is -136

400

-92  =  a  -  20

What is -72

400

-80  =  -10a  

What is 8

400

-28 = a/-2

What is 56

400

c  -  1.2 = 15.5

What is 16.7

500

-20 = c + 20

What is -40

500

x - 327 = -665

What is -338

500

-5e = -400

What is 80

500

-8 = x/-15

What is 120

500

-8y = -96

What is 12