-3+7/18-17/18+2/9= -15+7/20 - 9/30+3 =
-3+7/18-17/18+2/9=-3-10/18+2/9=-3-5/9+2/9=-3-3/9=-3-1/3=-3 1/3-15+7/20 - 9/30+3 =-12+21/60-18/60=-12+3/60=-12+1/20=-11 19/20