By the middle of the 18th century, what geographic area exercised a still greater musical influence?

Central Europe was mostly the place that influenced everyone the most. Germany, Austria, and Italy, being the musical leaders of the world, Austria being the most famous since Vienna was a musical center of the world. There were however famous composers in places such as Russia and France too.

Answergranulation;

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2