help to proofread this sentence

[Vgv8]

[1, p.72] re-writes the sentence:
"Weight reduction can be accomplished only by reducing the density"
as
"Weight can be reduced only by reducing the density"
instead.

How can it be further improved
(without using passive voice and/or repetitions of "reduced"/"reducing")?

[1]
Brogan, John A. Clear Technical Writing

[Bookaholic_English]

inversion with only by...can
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Rolling stone gathers no moss.