4x²- [2x² + 3y - {4y + x² - (5x² - y)}]
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Answer:
16-[4+3-{4+2-(25-y)}]
16-[4+3-{4+2-24}]
16-[4+3-{6-24}]
16-[4+3-(-18)}]
16-[4+3+18]
16-25
-9
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