Medium Arithmetic Puzzles

#3423: 7 _ 6 _ 5 _ 2 = -8 medium #3429: 7 _ 6 _ 7 _ 3 = -7 medium #3436: 7 _ 6 _ 8 _ 4 = -5 medium #3438: 7 _ 6 _ 9 _ 3 = 9 medium #3445: 7 _ 7 _ 2 _ 6 = 13 medium #3449: 7 _ 7 _ 2 _ 5 = -9 medium #3451: 7 _ 7 _ 3 _ 6 = -7 medium #3453: 7 _ 7 _ 3 _ 3 = 10 medium #3455: 7 _ 7 _ 3 _ 3 = -8 medium #3458: 7 _ 7 _ 4 _ 8 = -7 medium #3461: 7 _ 7 _ 5 _ 2 = -9 medium #3462: 7 _ 7 _ 6 _ 3 = -7 medium #3463: 7 _ 7 _ 6 _ 2 = 13 medium #3466: 7 _ 7 _ 8 _ 4 = -7 medium #3469: 7 _ 8 _ 2 _ 4 = 11 medium #3472: 7 _ 8 _ 2 _ 3 = -5 medium #3477: 7 _ 8 _ 3 _ 6 = 11 medium #3478: 7 _ 8 _ 3 _ 2 = -5 medium #3487: 7 _ 8 _ 4 _ 6 = -5 medium #3488: 7 _ 8 _ 4 _ 7 = -7 medium #3493: 7 _ 8 _ 4 _ 2 = 12 medium #3496: 7 _ 8 _ 4 _ 4 = 10 medium #3497: 7 _ 8 _ 4 _ 5 = 9 medium #3499: 7 _ 8 _ 4 _ 6 = 8 medium #3506: 7 _ 8 _ 6 _ 3 = 11 medium #3509: 7 _ 8 _ 6 _ 4 = -5 medium #3511: 7 _ 8 _ 6 _ 9 = -5 medium #3512: 7 _ 8 _ 7 _ 4 = -7 medium #3516: 7 _ 8 _ 9 _ 6 = -5 medium #3522: 7 _ 9 _ 3 _ 4 = -5 medium #3534: 7 _ 9 _ 4 _ 3 = -5 medium #3540: 7 _ 9 _ 6 _ 8 = -5 medium #3544: 7 _ 9 _ 8 _ 6 = -5 medium #3549: 8 _ 2 _ 2 _ 4 = 9 medium #3556: 8 _ 2 _ 2 _ 4 = -4 medium #3557: 8 _ 2 _ 2 _ 5 = -6 medium #3558: 8 _ 2 _ 2 _ 6 = -8 medium #3560: 8 _ 2 _ 3 _ 6 = 12 medium #3564: 8 _ 2 _ 3 _ 4 = 12 medium #3567: 8 _ 2 _ 3 _ 3 = -5 medium #3568: 8 _ 2 _ 3 _ 4 = -8 medium #3569: 8 _ 2 _ 3 _ 1 = 11 medium #3572: 8 _ 2 _ 3 _ 4 = 8 medium #3582: 8 _ 2 _ 4 _ 2 = 9 medium #3583: 8 _ 2 _ 4 _ 6 = 11 medium #3590: 8 _ 2 _ 4 _ 3 = 12 medium #3595: 8 _ 2 _ 4 _ 7 = 11 medium #3597: 8 _ 2 _ 4 _ 8 = -4 medium