Arithmetic Operator Puzzles

#3313: 7 _ 4 _ 2 _ 7 = -7 medium #3314: 7 _ 4 _ 2 _ 2 = 16 hard #3315: 7 _ 4 _ 2 _ 3 = 11 medium #3316: 7 _ 4 _ 2 _ 4 = 18 hard #3317: 7 _ 4 _ 2 _ 4 = 10 medium #3318: 7 _ 4 _ 2 _ 5 = 19 hard #3319: 7 _ 4 _ 2 _ 5 = 9 easy #3320: 7 _ 4 _ 2 _ 6 = 8 easy #3321: 7 _ 4 _ 2 _ 7 = 7 easy #3322: 7 _ 4 _ 2 _ 9 = 5 easy #3323: 7 _ 4 _ 3 _ 2 = 13 medium #3324: 7 _ 4 _ 3 _ 6 = 9 easy #3325: 7 _ 4 _ 3 _ 6 = 15 hard #3326: 7 _ 4 _ 3 _ 9 = 19 hard #3327: 7 _ 4 _ 3 _ 2 = 1 easy #3328: 7 _ 4 _ 3 _ 6 = 5 easy #3329: 7 _ 4 _ 3 _ 6 = -1 easy #3330: 7 _ 4 _ 3 _ 9 = -5 medium #3331: 7 _ 4 _ 4 _ 2 = 15 hard #3332: 7 _ 4 _ 4 _ 8 = 9 medium #3333: 7 _ 4 _ 4 _ 2 = -1 easy #3334: 7 _ 4 _ 4 _ 8 = 5 easy #3335: 7 _ 4 _ 5 _ 2 = 17 hard #3336: 7 _ 4 _ 5 _ 2 = -3 easy #3337: 7 _ 4 _ 6 _ 3 = 15 hard #3338: 7 _ 4 _ 6 _ 8 = 10 medium #3339: 7 _ 4 _ 6 _ 3 = -1 easy #3340: 7 _ 4 _ 6 _ 8 = 4 easy #3341: 7 _ 4 _ 6 _ 9 = 1 easy #3342: 7 _ 4 _ 7 _ 2 = -7 medium #3343: 7 _ 4 _ 7 _ 3 = 12 easy #3344: 7 _ 4 _ 7 _ 4 = 16 medium #3345: 7 _ 4 _ 7 _ 5 = 20 hard #3346: 7 _ 4 _ 8 _ 2 = 8 medium #3347: 7 _ 4 _ 8 _ 6 = 10 medium #3348: 7 _ 4 _ 8 _ 2 = -9 hard #3349: 7 _ 4 _ 8 _ 2 = 6 easy #3350: 7 _ 4 _ 8 _ 6 = 4 easy #3351: 7 _ 4 _ 8 _ 4 = 14 medium #3352: 7 _ 4 _ 8 _ 1 = 15 hard #3353: 7 _ 4 _ 8 _ 1 = 13 hard #3354: 7 _ 4 _ 8 _ 2 = 16 hard #3355: 7 _ 4 _ 8 _ 3 = 11 medium #3356: 7 _ 4 _ 8 _ 4 = 18 hard #3357: 7 _ 4 _ 8 _ 4 = 10 medium #3358: 7 _ 4 _ 8 _ 5 = 19 hard #3359: 7 _ 4 _ 8 _ 5 = 9 medium #3360: 7 _ 4 _ 8 _ 6 = 20 hard