Respostas

2014-05-17T15:53:58-03:00
X=?
4-4(a+x)=a-5x
4 -4a + 4x = a - 5x
4x + 5x -4a + 4 = a
9x - 4a + 4 = a
9x = a + 4a - 4
9x = 5a - 4
x = 5a - 4/9  substituinto o valor de (a) = 1

x = 5a - 4/9
x = 5(1) - 4/9
x = 5 - 5/9
       45 - 5                 40
x = ------------------  =    -----
            9                    9

x = 40/9

2(a-1)
2a - 2 
2a - 2 = 0
2a = 2
a = 2/2
a = 1