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2014-07-31T18:12:39-03:00
Olá, Cecífreire!

a) 6x - 11 = 5x - 3
6x - 5x = -3 + 11
x = 8

b) 6x + 9 = 4x + 9
6x - 4x = 9 - 9
2x

c) 8y - 5 = 2y + 1
8y - 2y = 1 + 5
4y = 6
y = 6:2 / 4:2
y = 3/2

d) 5x - 5 = 8x + 2
5x - 8x = 2 + 5
-3x = 7
x = 7/-3
2 5 2