Hard Arithmetic Puzzles

#4353: 9 _ 4 _ 8 _ 2 = -7 hard #4356: 9 _ 4 _ 8 _ 4 = 18 hard #4357: 9 _ 4 _ 8 _ 1 = 19 hard #4358: 9 _ 4 _ 8 _ 1 = 17 hard #4359: 9 _ 4 _ 8 _ 2 = 16 hard #4360: 9 _ 4 _ 8 _ 3 = 15 hard #4362: 9 _ 4 _ 8 _ 4 = 14 hard #4363: 9 _ 4 _ 8 _ 5 = 13 hard #4364: 9 _ 4 _ 8 _ 7 = 11 hard #4368: 9 _ 4 _ 9 _ 6 = 15 hard #4369: 9 _ 4 _ 9 _ 2 = -9 hard #4374: 9 _ 4 _ 9 _ 4 = 16 hard #4375: 9 _ 4 _ 9 _ 5 = 20 hard #4377: 9 _ 5 _ 2 _ 4 = 19 hard #4380: 9 _ 5 _ 2 _ 6 = 15 hard #4381: 9 _ 5 _ 3 _ 6 = 19 hard #4384: 9 _ 5 _ 3 _ 1 = 14 hard #4385: 9 _ 5 _ 3 _ 2 = 17 hard #4386: 9 _ 5 _ 3 _ 3 = 18 hard #4387: 9 _ 5 _ 3 _ 3 = 12 hard #4388: 9 _ 5 _ 3 _ 4 = 19 hard #4389: 9 _ 5 _ 3 _ 5 = 20 hard #4394: 9 _ 5 _ 4 _ 2 = 19 hard #4395: 9 _ 5 _ 4 _ 8 = 19 hard #4398: 9 _ 5 _ 6 _ 3 = 19 hard #4401: 9 _ 5 _ 6 _ 2 = 15 hard #4402: 9 _ 5 _ 8 _ 4 = 19 hard #4406: 9 _ 5 _ 9 _ 3 = 15 hard #4407: 9 _ 5 _ 9 _ 4 = 20 hard #4408: 9 _ 6 _ 2 _ 3 = 13 hard #4412: 9 _ 6 _ 2 _ 9 = 18 hard #4420: 9 _ 6 _ 2 _ 5 = 15 hard #4424: 9 _ 6 _ 2 _ 8 = 11 hard #4429: 9 _ 6 _ 3 _ 2 = 18 hard #4430: 9 _ 6 _ 3 _ 9 = 11 hard #4431: 9 _ 6 _ 3 _ 4 = 17 hard #4432: 9 _ 6 _ 3 _ 5 = 19 hard #4437: 9 _ 6 _ 3 _ 8 = -7 hard #4438: 9 _ 6 _ 3 _ 4 = 18 hard #4440: 9 _ 6 _ 4 _ 3 = 17 hard #4441: 9 _ 6 _ 4 _ 8 = 12 hard #4442: 9 _ 6 _ 4 _ 6 = 18 hard #4452: 9 _ 6 _ 4 _ 3 = 18 hard #4454: 9 _ 6 _ 4 _ 5 = 11 hard #4456: 9 _ 6 _ 4 _ 6 = 12 hard #4457: 9 _ 6 _ 4 _ 7 = 13 hard #4459: 9 _ 6 _ 4 _ 8 = 14 hard #4461: 9 _ 6 _ 4 _ 9 = 15 hard