7 - 6+_=13, 11 - 9+__=20, 0 - 14+_=14, 4 - 17-_=13, 9 - 8+_=17, 10 - 20-_=10, 5 - 13+_=18, 3 - 3+_=6, 6 - 16-10=,

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