Medium Arithmetic Puzzles

#3121: 6 _ 8 _ 4 _ 6 = 9 medium #3123: 6 _ 8 _ 4 _ 7 = 10 medium #3124: 6 _ 8 _ 4 _ 7 = -4 medium #3125: 6 _ 8 _ 4 _ 8 = 11 medium #3126: 6 _ 8 _ 4 _ 8 = -5 medium #3127: 6 _ 8 _ 4 _ 9 = -6 medium #3129: 6 _ 8 _ 5 _ 4 = -4 medium #3130: 6 _ 8 _ 6 _ 3 = 10 medium #3132: 6 _ 8 _ 6 _ 4 = -6 medium #3138: 6 _ 8 _ 7 _ 4 = -8 medium #3150: 6 _ 9 _ 3 _ 4 = -6 medium #3153: 6 _ 9 _ 3 _ 4 = 6 medium #3154: 6 _ 9 _ 3 _ 5 = -3 medium #3155: 6 _ 9 _ 3 _ 5 = 10 medium #3156: 6 _ 9 _ 3 _ 6 = 8 medium #3157: 6 _ 9 _ 3 _ 6 = -4 medium #3158: 6 _ 9 _ 3 _ 7 = 9 medium #3159: 6 _ 9 _ 3 _ 7 = -5 medium #3161: 6 _ 9 _ 3 _ 8 = -6 medium #3167: 6 _ 9 _ 4 _ 3 = -6 medium #3171: 6 _ 9 _ 5 _ 3 = 10 medium #3175: 6 _ 9 _ 6 _ 8 = -6 medium #3178: 6 _ 9 _ 6 _ 2 = 6 medium #3180: 6 _ 9 _ 6 _ 3 = 7 medium #3182: 6 _ 9 _ 6 _ 4 = 8 medium #3185: 6 _ 9 _ 6 _ 5 = 9 medium #3188: 6 _ 9 _ 6 _ 6 = 10 medium #3190: 6 _ 9 _ 6 _ 7 = -3 medium #3192: 6 _ 9 _ 6 _ 8 = -4 medium #3194: 6 _ 9 _ 6 _ 9 = -5 medium #3196: 6 _ 9 _ 8 _ 6 = -6 medium #3198: 7 _ 1 _ 2 _ 8 = 11 medium #3200: 7 _ 1 _ 3 _ 9 = 10 medium #3202: 7 _ 1 _ 4 _ 8 = 9 medium #3206: 7 _ 2 _ 3 _ 3 = 13 medium #3207: 7 _ 2 _ 4 _ 8 = 8 medium #3208: 7 _ 2 _ 4 _ 6 = 10 medium #3209: 7 _ 2 _ 4 _ 8 = 11 medium #3211: 7 _ 2 _ 4 _ 3 = 11 medium #3219: 7 _ 2 _ 5 _ 5 = 13 medium #3220: 7 _ 2 _ 6 _ 4 = 10 medium #3221: 7 _ 2 _ 6 _ 2 = 11 medium #3224: 7 _ 2 _ 6 _ 7 = 14 medium #3228: 7 _ 2 _ 7 _ 7 = 13 medium #3235: 7 _ 2 _ 8 _ 4 = 8 medium #3239: 7 _ 2 _ 8 _ 2 = 10 medium #3240: 7 _ 2 _ 8 _ 4 = 12 medium #3242: 7 _ 2 _ 8 _ 2 = 14 medium