3 Simplify the following.
a 15 - [3 +{5 - (x-7)}]
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Answer:
15-[3+{5-(x-7)}]
= 15-[3+{5-x-7)}]
= 15-[3+(12-x)}]
= 15-[3+12-x]
= 15 -[15-x]
= 15-15+x
= x
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