-0,1(3a+5)+1,5a

To simplify the expression -0,1(3a+5)+1,5a, we first distribute the negative 0.1 into the terms inside the parentheses:

-0,13a - 0,15 + 1,5a

This simplifies to:

-0,3a - 0,5 + 1,5a

Next, we combine like terms by adding the coefficients of the 'a' terms together:

-0,3a + 1,5a = 1,2a

So, the final simplified expression is:

1,2a - 0,5