December 2019 1 8 Report
Reduza aos termos semelhantes:
a) 4x - 2a + x =
b) 7x + 2x - y - 2y =
c) 6a + 7y - 2y - 4a =
d) 15a + 10 - 3a + 1 =
e) a + 1 + a - 7
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