Respostas

2013-11-17T21:38:06-02:00
5x=4
x=4-5
x=-1

4x=6
x=6-4
x=2

7x=3
x=3-7
x=-4
2013-11-17T22:34:32-02:00

5x=4
x=4/5
x=0,8

4x=6
x=6/4
x=1,5

7x=3
x=3/7
x=0,43