Reduza os termos semelhantes: a) 30 - (16 - 5y ) + 12 y

b) 7m - [t - (3m + 12y) -4]

c) 8ab + 5b - 3a [4ab + (9a - 6b) - 12b]

d) x4 - (13xy + 7x4 ) - 20xy + 8x4

x4 = "x" elevado a quarta potência
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