2a^2+5a-7upon 2a^2-7a+5÷2a^3-a-21 upon 2a^2-11a+15
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simpelifes 31+ + [4] + 7 + 23 24 · divide the 10000÷35 · 2a^2+5a-7upon 2a^2-7a+5÷2a^3-a-21 upon 2a^2-11a+15.
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