Respuestas

2013-08-09T21:00:21+02:00
1)
2 - x - 3(x - 4) - 5 - 2(x + 1)
= 2 - x - 3x + 12 - 5 - 2x - 2
= 7 - 6x

2)
x - 5 = 4
x = 9

3)
3(2x - 4) = 2 - 3(x - 5)
6x - 12 = 2 - 3x + 15
9x = 29
x = 29 / 9
x = 3.222

2013-08-09T21:04:05+02:00
2-x-3(x-4)-5-2(x+1)
2-x-3x+12-5-2x-2
-3x-2x-x+12-5-2-2
-6x+3

x-5=4
x=4+5
x=9




3(2x-4)=2-3(x-5)
6x-12=2-3x+15
6x+3x=2+15+12
9x=29
x=29/9
x=3.222