( 0,3 - 1 / 20 ) ÷ ( 3 / 4 - 1,25 )

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To simplify this expression, we need to work through it step by step according to the order of operations (PEMDAS).

Step 1: First, let's deal with the division inside the parenthesis:

(3 - 1/20) ÷ (3/4 - 1.25)

Step 2: Perform the subtraction inside the parenthesis:

(2.95) ÷ (-0.25)

Step 3: Perform the division:

-2.95 / 0.25 = -11.8

Therefore, the simplified expression is -11.8.