Jabberwock:
How did you calculate that?
Neglecting R7 because it is only 1% of the value of R6, Resistors R6 and R7 are effectively in parallel (both are 'grounded' at one end, and connected together at the other end). Thus they are equivalent to the 50kΩ mentioned by ilguargua. The resistors R2, R3 and R5 add up to 300kΩ.
They form a potential divider with resistors of 300kΩ and 50kΩ.
The output voltage will be the input voltage multiplied by 50/(50 + 300) = 1/7
12V/7 = 1.7V