To simplify the expression, let's start by simplifying each term separately.

(-0,75) can be written as -3/4.

(-1 + 3/5) can be simplified by finding a common denominator. The common denominator is 5, so we have (-5/5 + 3/5) = -2/5.

0,5 can be written as 1/2.

Now, let's simplify the expression:

-3/4 - (-2/5) : 1/2 + (-1/4)

To subtract fractions, we need a common denominator. The common denominator is 20, so we have:

(-15/20) - (-8/20) : 10/20 + (-5/20)

Simplifying the subtraction and addition:

(-15 + 8) : 10 + (-5)

-7 : 10 + (-5)

To divide, we can multiply by the reciprocal, so we have:

-7/10 + (-5)

Combining like terms:

-7/10 - 5

To subtract fractions, we need a common denominator. The common denominator is 10, so we have:

(-7/10) - (50/10)

Simplifying the subtraction:

-57/10

Therefore, the simplified expression is -57/10.