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Question
2x − [3y − {2x − (y − x)}] = ?
Options
5x − 4y
4y − 5x
5y − 4x
4x − 5y
Solution
5x − 4y
2x − [3y − {2x − (y − x)}]
= 2x − [3y − {2x − y + x}]
= 2x − [3y − {3x − y}]
= 2x − [3y − 3x + y]
= 2x − [4y − 3x]
= 2x − 4y + 3x
= 5x − 4y
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