Respostas

2013-11-07T14:13:50-02:00
X-3=1 ----> X=4 

2x+3=17 ----> 2x=14  X=14/2 = 7.

2x-3=17 ----> 2x=20   X= 10.

5-2x= -17 ---> -2x= -22  X=11

-2x-2=-5 ---> -2x=-3 X=1,5

4=2x+4 0=2x  X=0 

Acho que é isso aê !
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2013-11-07T14:14:41-02:00
X - 3 = 1
x = 1 + 3
x = 4 

2x + 3 = 17
2x = 17 - 3
2x = 14
x = 14/2
x = 7

5 - 2x = -17
-2x = -17 - 5
-2x = -12 .(-1)
2x = 12
x = 12/6
x = 6

-2x - 2 = -5
-2x = -5 +2
-2x = -3 .(-1)
2x = 3
x = 3/2

4 = 2x + 4
2x + 4 = 4
2x = 4-4
2x = 0
x = 0/2
x = 0
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