Short answer: No, it is not equal to −6,000,000. interpretation I used:
Treat 1\2-2 as the fraction 1/2 - 2 = −3/2.
Treat each 1 [1\2-2] as multiplication 1 * (−3/2) = −3/2.
There are six repeats of that factor, so their product is (−3/2)^6 = 729/64.
Then interpret the surrounding 100, 100 [...] 2] 2 as 100 * 100 * (that product) * 2 * 2.