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• goal: revalue the minuend and subtrahend • so 'restore' the 10 by adding x to [10 less x] • and complete the goal by adding x to [14] giving: then: [14 and x] less [10] then: = [x and 14 less 10] then: = [x and 4] now: 14 + x − 10 now: = x + 4 2/3