3+8*15-34+18*1,2

Assuming the comma is a decimal separator (so 1,2 = 1.2):

• 8 × 15 = 120
• 18 × 1.2 = 21.6
• Then: 3 + 120 − 34 + 21.6 = 110.6

Final answer: 110.6

If you meant something else by the comma, let me know and I’ll adjust.