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Since the question is 3(2a), then just write it out. 3(2a) is 2a+2a+2a or 6a.
The multiplicative inverse of -2a is 1/(-2a) = -1/2a
2a+2a-7b+7b
=4a
yes, it stands for Graphic Interchange Format.
The files in the gif format have the .gif extension.
a-^2a-b^-a-b