Question

A) X+5=8

B ) X - 4 = 3

C ) X + 6 = 5

D ) X - 7 = - 8

E ) X + 9 = - 1

F ) X - 39 = 79

G ) 10 = X + 8

H ) 15 = X + 20

I ) 4 = X - 10

J ) 7 = + 8

Answer 1

a) x + 5 = 8  ⇔ x = 8 - 5 ⇔ x = 3

b) x - 4 = 3  ⇔ x = 3 + 4 ⇔ x = 7

c) x + 6 = 5  ⇔ x = 5 - 6 ⇔ x = -1

d) x - 7 = -8  ⇔ x = -8 + 7 ⇔ x = -1

e) x + 9 = -1  ⇔ x = -1 - 9 ⇔ x = -10

f) x - 39 = 79  ⇔ x = 79 + 39 ⇔ x = 118

g) 10 = x + 8  ⇔ x = 10 - 8 ⇔ x = 2

h) 15 = x + 20  ⇔ x = 15 - 20 ⇔ x = -5

i) 4 = x - 10  ⇔ x = 4 + 10 ⇔ x = 14

j) 7 = x + 8 ⇔ x = 7 - 8 ⇔ x = -1

Answer 2

A) x + 5 = 8

x = 8 - 5

x = 3

B) x - 4 = 3

x = 3 + 4

x = 7

C) x + 6 = 5

x = 5 - 6

x = -1

D) x - 7 = -8

x = -8 + 7

x = -1

E) x + 9 = -1

x = -1 - 9

x = -10

F) x - 39 = 79

x = 79 + 39

x = 118

G) 10 = x + 8

-x = 8 - 10

-x = -2

x = 2

H) 15 = x + 20

-x = 20 - 15

-x = 5

x = -5

I) 4 = x - 10

-x = -10 - 4

-x = -14

x = 14

J) 7 = x + 8

-x = 8 - 7

-x = 1

x = -1