Respostas

2014-07-02T17:53:20-03:00
4(x+1)=12  FAZER A DISTRIBUTIVA
4x + 4 = 12
4x = 12 - 4
4x = 8
x = 8/4
x = 2


9(x-3)+1=18
9x - 27 + 1 = 18
9x - 27 = 18 - 1
9x = 18 + 27 -1
9x =45 - 1
9x = 44
x = 44/9


5(3-x)=4x+18

15 - 5x = 4x + 18
15 - 5x - 4x = 18
-9x = 18 - 15
-9x = 8
x = 3/-9
x = - 3/9
x = -1/3

9(x-3(2x+2)=15

5(3-x)=2(x-4)+15
Pergunta adicionada via

15 - 5x =  2x - 8 + 15
15 - 5x - 2x =  - 8 + 15
-7x = - 8 + 15 - 15
-7x = - 8 + 0
-7x = - 8
x = -8/-7
x + 8/7