Simplifique estas expressões algébricas.

a- 2b - b + 5b

b- 7c - 2c - 8c + 10d

c- 7m - 3 m

d- -5 + 3t - 7 - 12t + 5

e- -5xy + 3xy - 7 + 2x - 12 - 2 x

f- m/3 - 2m/9
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