Respostas

2013-10-28T14:56:05-02:00
(x-1)=8-4(2x-3)
(x-1) = 8 - 8x + 12
x-1=8-8x+12
x+8x = 12 + 8 + 1
9x = 21
x = 21/9 (simplifica por 3)

x = 7/3

2 5 2
2013-10-28T15:05:37-02:00
(x-1)= 8-4(2x-3)
(x-1)=8-8x+12
x-1=8-8x+12
x+8x=8+12+1
9x=21
x=21/9 ou 2,33