1) Quais sentenças são equações:
a) 5x – 4 = 10 b) 7x + 12 – x + 8 =
c) 9x + 4 > x + 6 d) 11 + 8 = 25 – 6
e) 20 + x – 1 = 14 + 8x f) 50 – 27 = 19 + x
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