How did changes in the balance of power between 1871 and 1917 affect the history of europe and the middle east?

The correct answer is the following.

In 1873, German Chancellor Otto Von Bismarck formed the Three Emperor's League, joining forces with Russia and Austria-Hungary. The three of them committed to establishing open lines of communication to attain any situation that could affect them and stayed neutral in other countries war conflict. On the other hand, was the powerful Ottoman Empire having problems, but still controlled parts of Europe Balkans such as Bosnia-Herzegovina, the Middle East, and regions in North Africa. This changes in power and transitions in the balance of control affected Europe and the Middle East as previous happenings of the most announced World War 1. Expansionistic ideals, imperialism, totalitarianism, and the assassination of Franz Ferdinand, conducted Europe to the terrible World War 1.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation: