Respostas

2014-08-24T09:43:53-03:00
A)
2x+5=27
2x=27-5
2x=22
x=22/2
x=11

b)
4x-8=2x+6
4x-2x=6+8
2x=14
x=14/2
x=7

c)
7x+1=6x+6
7x-6x=6-1
x=5

d)
5x-3=2x-9
5x-2x=-9+3
3x=-6
x=-6/3
x=-2
2014-08-24T09:49:18-03:00
A)2x+5=27
2x=27-5
2x=22
x=11

b)4x-8=2x+6
4x-2x=6+8
2x=14
x=7

c)
7x+1=6x+6
7x-6x=6-1
x=5

d) 
5x-3=2x-9
5x-2x=-9+3
3x=-6
x=-2