Respostas

2014-08-19T11:15:19-03:00
A ) 3 ( x + 2 ) = 2x - 4
3x + 6 - 2x = - 4
3x - 2x = - 4 - 6
x = - 10

B ) 2 ( x - 1 ) = 3x + 4
2x - 2 - 3x = 4
- x = 4 + 2
- x = 6 . ( - 1 )
x = - 6

C ) 3 ( x - 2 ) = 4 ( 5x + 2 )
3x - 6 = 20x + 8
3x - 20x = 8 + 6
- 17x = 14 . ( - 1 )
17x = 14
x = 14/17
x = 0,82

D ) 7 ( x - 2 ) = 5 ( x + 3 )
7x - 14 = 5x + 15
7x - 5x = 15 + 14
2x = 29
x = 29/2
x = 14,5