Respostas

2013-09-01T12:06:32-03:00
6x/-1 = x+4
 multiplicando cruzado , temos :
6x = -x -4
6x+x = -4
7x = -4
x =  -4 / 7
2 4 2
2013-09-01T12:10:13-03:00
3 ( \frac{2}{-1} ) = x+4 <=>
<=> 3 (- \frac{2x}{1} ) = x+4 <=>
<=> 3 (-2x) = x+4 <=>
<=> -6x = x+4 <=>
<=> -6x -x=4 <=>
<=> -7x = 4 <=>
<=> 7x = - 4 <=>
<=> x =  - \frac{4}{7}
3 4 3