-1-2d
Reorder -1 and -2d.
-2d-1
Factor -1 out of -2d.
-(2d)-1
Rewrite -1 as -1(1).
-(2d)-1(1)
Factor -1 out of -(2d)-1(1).
-(2d+1)
Factor -1-2d
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Factor -1-2d