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Collecting like terms
- Simplify \(a-2a+3a-4a+5a-6a+…+49a-50a\)
- Consider consecutive pairs of terms, starting from the beginning.
- Fill in the blank: \((2x+1)+(2x+1)+(2x+1)+(2x+1) \equiv\) ___\((2x+1)\)
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