Medium Arithmetic Puzzles

#2968: 6 _ 6 _ 3 _ 9 = 8 medium #2969: 6 _ 6 _ 3 _ 4 = 14 medium #2975: 6 _ 6 _ 3 _ 7 = -8 medium #2976: 6 _ 6 _ 3 _ 1 = 13 medium #2978: 6 _ 6 _ 3 _ 2 = 14 medium #2979: 6 _ 6 _ 3 _ 3 = 15 medium #2981: 6 _ 6 _ 3 _ 4 = 16 medium #2991: 6 _ 6 _ 3 _ 3 = -8 medium #2992: 6 _ 6 _ 4 _ 3 = 14 medium #2993: 6 _ 6 _ 4 _ 8 = 9 medium #2997: 6 _ 6 _ 4 _ 8 = -6 medium #3004: 6 _ 6 _ 4 _ 5 = 14 medium #3018: 6 _ 6 _ 6 _ 4 = 15 medium #3019: 6 _ 6 _ 6 _ 9 = 10 medium #3022: 6 _ 6 _ 6 _ 2 = 13 medium #3025: 6 _ 6 _ 7 _ 3 = -8 medium #3027: 6 _ 6 _ 8 _ 4 = 9 medium #3028: 6 _ 6 _ 8 _ 4 = -6 medium #3031: 6 _ 6 _ 9 _ 3 = 8 medium #3034: 6 _ 6 _ 9 _ 2 = 6 medium #3036: 6 _ 6 _ 9 _ 4 = 8 medium #3039: 6 _ 6 _ 9 _ 5 = 9 medium #3043: 6 _ 6 _ 9 _ 7 = -3 medium #3045: 6 _ 6 _ 9 _ 8 = -4 medium #3046: 6 _ 6 _ 9 _ 9 = -5 medium #3048: 6 _ 7 _ 2 _ 4 = -8 medium #3052: 6 _ 7 _ 2 _ 7 = 14 medium #3055: 6 _ 7 _ 3 _ 6 = -8 medium #3057: 6 _ 7 _ 3 _ 1 = 13 medium #3060: 6 _ 7 _ 3 _ 3 = 11 medium #3062: 6 _ 7 _ 3 _ 4 = 10 medium #3069: 6 _ 7 _ 4 _ 2 = -8 medium #3070: 6 _ 7 _ 4 _ 8 = -8 medium #3072: 6 _ 7 _ 6 _ 3 = -8 medium #3073: 6 _ 7 _ 6 _ 2 = 14 medium #3075: 6 _ 7 _ 8 _ 4 = -8 medium #3077: 6 _ 8 _ 2 _ 4 = 10 medium #3080: 6 _ 8 _ 2 _ 3 = -6 medium #3086: 6 _ 8 _ 3 _ 2 = -6 medium #3094: 6 _ 8 _ 3 _ 5 = 11 medium #3095: 6 _ 8 _ 3 _ 7 = 9 medium #3096: 6 _ 8 _ 3 _ 8 = 8 medium #3097: 6 _ 8 _ 3 _ 9 = 7 medium #3100: 6 _ 8 _ 4 _ 3 = 12 medium #3102: 6 _ 8 _ 4 _ 5 = -4 medium #3103: 6 _ 8 _ 4 _ 6 = -6 medium #3104: 6 _ 8 _ 4 _ 7 = -8 medium #3119: 6 _ 8 _ 4 _ 5 = 8 medium