(10-5,5)•2-15•2+10

Assuming the comma is a decimal separator:

Expression: (10 - 5,5) • 2 - 15 • 2 + 10

• 10 - 5,5 = 4,5
• 4,5 • 2 = 9
• 15 • 2 = 30
• 9 - 30 + 10 = -11

Final answer: -11