4) simplifique as expressões algébricas a seguir:
a)4x + 2x + 8 - 3x
b)6a - 18a + 14a

5)resolva as equações:
a)5x + 14x = 38
b)6x + 9 - 2x = 36
c)5x - 7 + 4x = 7x + 27

com a conta por favor
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