6,5-4,6(5,1+1.9)

Assuming decimal comma usage (6,5 - 4,6(5,1+1,9) means 6.5 - 4.6*(5.1 + 1.9)):

• Inside parentheses: 5.1 + 1.9 = 7.0
• Multiply: 4.6 * 7.0 = 32.2
• Subtract: 6.5 - 32.2 = -25.7

Final answer: -25.7