Respostas

2013-12-17T20:38:20-02:00
A)
x+5=2
x=2-5
x=-3

b)
2x-15+53=0
2x=-53+15
2x=-38
x=-38/2
x= -19

c)
5x+20=3x-63
5x-3x=-63-20
2x=-83
x=-83/2
x= -41,5
2013-12-18T01:53:35-02:00
A) x + 5 = 2
x = 2 - 5
x = - 3

b) 2x - 15 + 53
2x = 53 + 15
2x = 68
x = 68 ÷ 2
x = 34

c) 5 (x + 4) = 3 (x - 21)
5x + 20 = 3x - 63
5x - 3x = - 63 - 20
2x = - 83
x = - 83 ÷ 2
x = - 41,5

d) 4x - 19 = 6x + 47
4x - 6x = 47 + 19
- 2x = 66
x = 66 
÷ (- 2)
x = - 33