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Notice that -4 and can both have 4 divided into them and you still have a whole number.
So you can "pull out" the 4:
4( -1 - 12/4 a) = 4 ( -1 - 3a) and if you want you can grab the negative while you're at it:
-4-12a = -4 (1 + 3a) remember to change that sign inside.
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