7 chap. 2

+ equations

100

x + 9 = 20

x = 11

200

-13 + x = 18

x = 31

300

-5 = x + (-7)

x = 2

400

-7 = -2 + x

x = -5

500

-1 = x + 3²

x = -10

- equations

100

x - 32 = 38

x = 70

200

-14 = x - 6

x = -8

300

16 = x - (-12)

x = 4

400

x - (-56) = -3

x = -59

500

34 = 4 - x

x = -30

x equations

100

9x = -72

x = -8

200

-3x = 42

x = -14

300

152 = -4x

x = -38

400

-2x = -62

x = 31

500

20 = 7x - 12x

x = -4

÷ equations

100

x/7 = 8

x = 56

200

x/-7 = -7

x = 49

300

x/12 = 12

x = 144

400

7 = x/21

x = 147

500

x/3 = 18

x = 54

2-step

100

2x + 17 = 29

x = 6

200

3x - 10 = 35

x = 15

300

-24 = 3x - (-15)

x = -13

400

2 = x/9 + 5

x = -27

500

x/9 - 7 = 97

x = 936