1° ~ Verifique, em cada caso, se as equações são equivalentes ou não. a) x - 8 = 6 e x = 14

b) 2y - 1 + y, 3y = - 6 e y + 2 = 5

c) 4z + 1 = z + 7, 3z = 6 e z = 2

d) 2a + a = 12, 2a = 6 e a = 3
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