Respostas

2014-08-04T19:26:15-03:00
5(3-x)- 4x =18
15 - 5x -4x =18
-5x -4x= 18 -15
-9x = 3 .(-1)
9x = -3
x= -3 /9 (simplificando por 3)
x= -1/3
13 4 13
2014-08-04T19:26:36-03:00
15-5x-4x=18
-5x-4x=18-15
-9x=3 (-1)
9x=3
x= 3/9
x=1/3
5 4 5