the new math

3+2[-3(5-1)-6]-7
= 3+2[-3(4)-6]-7
= 3+2[-12-6]-7
= 3+2[-18]
= 3+[-36]-7
= -33-7
= -40

You didn't see that coming, did you?

Now I am off to conquer x^2-9x+14...