Respostas

2013-12-16T18:47:25-02:00
A) 2x + 6 = x + 18
2x - x = 18 - 6
x = 12

b) 5x - 3 = 2x + 9
5x - 2x = 9 + 3
3x = 12
x = 12/3
x = 4

c) 3 (2x - 3) + 2(x + 1) = 3x + 18
6x - 9 + 2x + 2 = 3x + 18
6x + 2x - 3x = 18 + 9 - 2
5x = 25
x = 5

d) 2x + 3(x - 5) = 4x + 9
2x + 3x - 15 = 4x + 9
2x + 3x - 4x = 9 + 15
x = 24