7 = 4 + _ - 3, 19 = 20 - _ - 1, 8 = _ + 2 - 6, 17 = 19 - _ - 2, 12 = 7 + _ - 5, 9 = 19 - _ - 10, 11 = _ + 3 - 8, 13 = 4 + _ - 9, 16 = 20 - _ - 4, 7 = 14 - _ - 7,

Sum or Difference to the Left of the Equal Sign

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