Respostas

2014-08-18T18:55:51-03:00
Olá, BruninhaDu!

7x + 4 - 5x < 20
7x - 5x < 20 + 4
2x < 24
x < 24 / 2
x < 12

2x - 9 < 5x - 3
2x - 5x < - 3 + 9
-3x < 6
x < 6 / -3
x < -2