Respostas

2013-08-07T19:10:07-03:00
2x + 1 = 4x - 7
2x - 4x = -7 -1
-2x = -8
2x = 8
x = 8\2
x = 4
10 4 10
2013-08-07T19:33:41-03:00
2x+1=4x-7
2x-4x=-7-1
-2x=-8
2x=8
x=8÷2
x=4
2 5 2