Respostas

2014-06-23T17:30:17-03:00
4x+40=2x+60
4x-2x=60-40
2x=20
x=20/2
x=10
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2014-06-23T17:30:34-03:00
4x + 40 = 2x + 60
4x - 2x = 60 - 40
2x = 20
x = 20 : 2
x = 10

R: Esse número será o 10.
1 1 1