Hard Matchstick Puzzles

#323: Fix 0+7=75 hard #324: Fix 3-8=3 hard #326: Fix 9+1=0 hard #329: Fix 8+5=2 hard #331: Fix 5-5=70 hard #332: Fix 2-4=8 hard #335: Fix 9+2=6 hard #336: Fix 7-3=70 hard #338: Fix 6-4=9 hard #339: Fix 0-9=8 hard #340: Fix 6-8=13 hard #341: Fix 9-7=76 hard #342: Fix 5-8=73 hard #344: Fix 5+9=75 hard #345: Fix 1-8=8 hard #346: Fix 6+7=75 hard #348: Fix 4-6=18 hard #349: Fix 6-0=8 hard #354: Fix 6+5=72 hard #355: Fix 9+6=2 hard #357: Fix 4-6=70 hard #360: Fix 9-6=75 hard #366: Fix 5-8=5 hard #367: Fix 7+6=75 hard #370: Fix 1+5=72 hard #379: Fix 9-2=71 hard #381: Fix 9+6=1 hard #385: Fix 6-8=74 hard #391: Fix 4-7=71 hard #395: Fix 7-8=7 hard #399: Fix 8-6=12 hard #400: Fix 0+6=74 hard #403: Fix 9+0=1 hard #407: Fix 6-5=17 hard #408: Fix 3-8=12 hard #410: Fix 9+6=74 hard #411: Fix 6+3=71 hard #413: Fix 0+2=70 hard #422: Fix 7-2=8 hard #423: Fix 8-3=17 hard #424: Fix 1-8=10 hard #428: Fix 6+8=76 hard #432: Fix 0+8=0 hard #434: Fix 9-8=77 hard #435: Fix 5-7=72 hard #436: Fix 7+1=74 hard #439: Fix 6+4=72 hard #440: Fix 9+9=79 hard