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Question
Simplify:
x − [y + {x − (y + x)}]
Sum
Solution
x − [y + {x − (y + x)}]
= x − [y + {x − y − x}]
= x − [y + x − y − x]
= x − y − x + y + x
= x − x + x − y + y
= x
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Concept of Substitution
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