# A4a – Simplifying and manipulating algebraic expressions by collecting like terms

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# Collecting like terms

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• Simplify $$a-2a+3a-4a+5a-6a+…+49a-50a$$
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• Fill in the blank:  $$(2x+1)+(2x+1)+(2x+1)+(2x+1) \equiv$$ ___$$(2x+1)$$
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