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OpenStudy (anonymous):
Simplifying Algebraic Expressions... 9x^2-14x^2+20x^2
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OpenStudy (xxdragoonxx):
9x^2-14x^2+20x^2 = 9x^2+-14x^2=-5x^2-5x^2+20x^2 = -5x^2+20x^2=15x^2
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