12. Simplify: (2-7 – 3-4)' + (2-1-4-1)
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1
Answer:
(2-7 - 3-4) + (2-1-4-1)
(5-1) + (1-4-1)
(5-1) + (3-1)
(5-1) + 2
4+2
6
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