1/3+-1/3+-3/3+-5/3+-7/3+-3
Sorry, that should be (1-1-3-5-7)/3 - 9/3 = -24/3 = -8
(1 + -1 + -3 + -5 + -7 )/3 + 9/3 = ( -15 + 9 )/3 = -6/3 = -2