Start with:
Change it to:

(((2*x)+(4*y))+(3*x))
(((2*x)+(4*y))+(3*x))
CURRENT: ( + ( + ( * 2 x ) ( * 4 y ) ) ( * 3 x ) )
GOAL: ( + ( * ( + 2 3 ) x ) ( * 4 y ) )

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