calcule as adições e subtracoes com os termos (letras) iguais:
a) 5a + 12a - 6a +3a=
b)18x +25x +42x - 39x=
c)40y - 31y - 7y +16y - 8y=
d)2.(24b + 17b - 12b)=
e)156k + 245k - 378k=​
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