Verified answer

Bonsoir.

a. x - 8 = 12

x = 12 + 8

x = 20

b. y - 7 = - 4

y = - 4 + 7

y = 3

c. n - 9 = 11

n = 11 + 9

n = 20

d. x - 4 = - 15

x = - 15 + 4

x = - 11

Bonne soirée :)