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2014-02-09T14:38:23-02:00
5x+9=2x+2
5x-2x=2-9
3x=-7
x=-7/3

2x-8=x+5
2x-x=5+8
x=13

4x+8=20
4x=20-8
4x=12
x=12/4
x=3
2 5 2
2014-02-09T15:19:35-02:00
5x+9= 2x+2
5x-2x= 2-9
3x= -7
x= -7
     3

2x-8= x+5
2x-x= 5+8
x= 13

4x+8=20
4x= 20-8
4x= 12
x= 12
      4
x= 3