Respostas

2014-08-07T18:55:18-03:00
Olá, Gabrielamaria!

a) 7x - 4 + x = 20
7x + x = 20 + 4
8x = 24
x = 24 / 8
x = 3

b) 5x - 3 = 6 + x
5x - x = 6 + 3
6x = 9
x = 9 / 6
x = 9:3 / 6:3
x = 3 / 2

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