Which best explains how the russian revolution altered the balance of power during world war i?
russia's new government exited the war, making it easier for the central powers to focus on the other allied countries.
russia's new government exited the war, leading to victory for the central powers over the other allied countries.
russia's new government negotiated a peace treaty, bringing austria-hungary into the war with the other allied countries.
russia's new government negotiated a peace treaty, bringing the united states into the war with the other allied countries.

Russia's new government exited the war, making it easier for the Central Powers to focus on the other Allied countries.

Explanation:

This is inherently clear since German officials actually orchestrated the Russian Revolution by sending Lenin, who was exiled to Switzerland, on a train and into Russia. This is also furthered by evidence pertaining to German Kaiser Friedrich Wilhelm Viktor Albert's desire to only fight a one front war, not a two front war with Russia and then France. More evidence in this can be seen in the beginning ideas and formulation of the Schlieffen Plan .

1.3x - 2 - (3.3x + 5) = 2x + 1

1.3x - 2 - 3.3x - 5 = 2x + 1

-2x - 7 = 2x + 1

-7 = 4x + 1

-8 = 4x

x = -2