Arithmetic Operator Puzzles

#3457: 7 _ 7 _ 3 _ 9 = 3 easy #3458: 7 _ 7 _ 4 _ 8 = -7 medium #3459: 7 _ 7 _ 4 _ 2 = 9 easy #3460: 7 _ 7 _ 4 _ 4 = 17 hard #3461: 7 _ 7 _ 5 _ 2 = -9 medium #3462: 7 _ 7 _ 6 _ 3 = -7 medium #3463: 7 _ 7 _ 6 _ 2 = 13 medium #3464: 7 _ 7 _ 6 _ 3 = 19 hard #3465: 7 _ 7 _ 7 _ 2 = 15 hard #3466: 7 _ 7 _ 8 _ 4 = -7 medium #3467: 7 _ 7 _ 8 _ 2 = 17 hard #3468: 7 _ 7 _ 9 _ 2 = 19 hard #3469: 7 _ 8 _ 2 _ 4 = 11 medium #3470: 7 _ 8 _ 2 _ 3 = 19 hard #3471: 7 _ 8 _ 2 _ 4 = 3 easy #3472: 7 _ 8 _ 2 _ 3 = -5 medium #3473: 7 _ 8 _ 2 _ 8 = 20 hard #3474: 7 _ 8 _ 2 _ 9 = 19 hard #3475: 7 _ 8 _ 3 _ 2 = 19 hard #3476: 7 _ 8 _ 3 _ 4 = 13 hard #3477: 7 _ 8 _ 3 _ 6 = 11 medium #3478: 7 _ 8 _ 3 _ 2 = -5 medium #3479: 7 _ 8 _ 3 _ 4 = 1 easy #3480: 7 _ 8 _ 3 _ 6 = 3 easy #3481: 7 _ 8 _ 3 _ 6 = -9 hard #3482: 7 _ 8 _ 4 _ 3 = 13 hard #3483: 7 _ 8 _ 4 _ 5 = 17 hard #3484: 7 _ 8 _ 4 _ 6 = 19 hard #3485: 7 _ 8 _ 4 _ 3 = 1 easy #3486: 7 _ 8 _ 4 _ 5 = -3 easy #3487: 7 _ 8 _ 4 _ 6 = -5 medium #3488: 7 _ 8 _ 4 _ 7 = -7 medium #3489: 7 _ 8 _ 4 _ 8 = -9 hard #3490: 7 _ 8 _ 4 _ 1 = 15 hard #3491: 7 _ 8 _ 4 _ 1 = 13 hard #3492: 7 _ 8 _ 4 _ 2 = 16 hard #3493: 7 _ 8 _ 4 _ 2 = 12 medium #3494: 7 _ 8 _ 4 _ 3 = 17 hard #3495: 7 _ 8 _ 4 _ 4 = 18 hard #3496: 7 _ 8 _ 4 _ 4 = 10 medium #3497: 7 _ 8 _ 4 _ 5 = 9 medium #3498: 7 _ 8 _ 4 _ 6 = 20 hard #3499: 7 _ 8 _ 4 _ 6 = 8 medium #3500: 7 _ 8 _ 4 _ 7 = 7 easy #3501: 7 _ 8 _ 4 _ 8 = 6 easy #3502: 7 _ 8 _ 4 _ 9 = 5 easy #3503: 7 _ 8 _ 5 _ 4 = 17 hard #3504: 7 _ 8 _ 5 _ 4 = -3 easy