Réponses

2013-04-20T16:16:36+02:00

X - 3 = 12.3

X - 3 + 3 = 12.3 + 3

X = 15.3

 

5X + 4 = 28

5x + 4 - 4 = 28 - 4

5x / 5 = 24 / 5

X = 4,8

 

4X + 9 < 10X - 6

4X + 9 - 10X < 10X - 6 - 10X

-6X + 9 - 9 < -6 - 9

-6X / -6 < -15 / -6

X < 2,5