Sagot :

Bjr,

x + 7 = -3

x = - 3 - 7

x = -10

x - 7 = - 3

x = - 3 + 7

x = 4

x + 7 = 3

x = 3 - 7

x = -4

x - 7 = 3

x = 3 + 7

x = 10

4x = 8

x = 8/4 = 2

8x = 4

x = 4/8 = 2/4 = 1/2 = 0.5