Respostas

2014-06-12T18:41:54-03:00
X+2x+3-5x=4x-9
x+2x-5x-4x=-9-3
3x-9x=-12
-6x=-12.(-1)
6x=12
x=12/6
x=2
2014-06-12T18:48:26-03:00
Olá, Denise13!

x + 2x + 3 - 5x = 4x - 9
x + 2x - 5x - 4x + 9 + 3 = 0
3x - 9x + 12 = 0
-6x + 12 = 0
-6x = -12
-6x = -12 (-1)
6x = 12
x = 12 / 6
x = 2