Hard Arithmetic Puzzles

#2917: 6 _ 5 _ 2 _ 2 = 17 hard #2919: 6 _ 5 _ 2 _ 3 = 18 hard #2925: 6 _ 5 _ 3 _ 9 = -9 hard #2929: 6 _ 5 _ 3 _ 2 = 20 hard #2935: 6 _ 5 _ 3 _ 7 = 17 hard #2937: 6 _ 5 _ 3 _ 8 = 18 hard #2939: 6 _ 5 _ 3 _ 9 = 19 hard #2942: 6 _ 5 _ 4 _ 8 = 16 hard #2949: 6 _ 5 _ 6 _ 9 = 20 hard #2953: 6 _ 5 _ 8 _ 4 = 16 hard #2955: 6 _ 5 _ 9 _ 3 = -9 hard #2957: 6 _ 5 _ 9 _ 6 = 20 hard #2964: 6 _ 6 _ 2 _ 7 = 15 hard #2970: 6 _ 6 _ 3 _ 7 = 20 hard #2983: 6 _ 6 _ 3 _ 5 = 17 hard #2986: 6 _ 6 _ 3 _ 7 = 19 hard #2987: 6 _ 6 _ 3 _ 8 = 20 hard #2990: 6 _ 6 _ 3 _ 6 = 19 hard #2998: 6 _ 6 _ 4 _ 9 = 16 hard #3006: 6 _ 6 _ 4 _ 7 = 16 hard #3008: 6 _ 6 _ 4 _ 8 = 17 hard #3010: 6 _ 6 _ 4 _ 9 = 18 hard #3012: 6 _ 6 _ 4 _ 4 = 17 hard #3016: 6 _ 6 _ 5 _ 9 = 20 hard #3023: 6 _ 6 _ 6 _ 3 = 19 hard #3024: 6 _ 6 _ 7 _ 3 = 20 hard #3026: 6 _ 6 _ 7 _ 2 = 15 hard #3030: 6 _ 6 _ 8 _ 2 = 17 hard #3037: 6 _ 6 _ 9 _ 4 = 16 hard #3041: 6 _ 6 _ 9 _ 5 = 20 hard #3042: 6 _ 6 _ 9 _ 7 = 11 hard #3044: 6 _ 6 _ 9 _ 8 = 12 hard #3047: 6 _ 7 _ 2 _ 4 = 20 hard #3049: 6 _ 7 _ 2 _ 2 = 19 hard #3050: 6 _ 7 _ 2 _ 4 = 17 hard #3051: 6 _ 7 _ 2 _ 6 = 15 hard #3053: 6 _ 7 _ 2 _ 8 = 13 hard #3054: 6 _ 7 _ 2 _ 9 = 12 hard #3056: 6 _ 7 _ 3 _ 9 = 14 hard #3058: 6 _ 7 _ 3 _ 2 = 16 hard #3059: 6 _ 7 _ 3 _ 3 = 17 hard #3061: 6 _ 7 _ 3 _ 4 = 18 hard #3063: 6 _ 7 _ 3 _ 5 = 19 hard #3067: 6 _ 7 _ 4 _ 2 = 20 hard #3068: 6 _ 7 _ 4 _ 8 = 20 hard #3071: 6 _ 7 _ 6 _ 3 = 20 hard #3074: 6 _ 7 _ 8 _ 4 = 20 hard #3076: 6 _ 7 _ 9 _ 3 = 14 hard