Respostas

2014-08-07T09:08:04-03:00
A) 4x=20-1x
4x+1x=20
5x=20
x=20/5
x=4

B)2x+4x=216-3x
2x+4x+3x=216
9x=216
x=216/9
x=24

C) 6x+4x+3x=624
13x=624
x=624/13
x=48

D) 5x+8x=680-4x
5x+8x+4x=680
17x=680
x=680/17
x=40

E) 3x-4x=24x+8
3x-4x-24x=8
-25x=8
x=8/-25
x= -0,32

F) 5x+14=4x+8
5x-4x=8-14
x=6