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The sum of -3x^2 or 3x^2 and 7x^2 is 10x^2
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The sum of -3x^2 or 3x^2
and 7x^2 is 10x^2

User Kasyx
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|\pm3x^2|+7x^2=10x^2\\\\|-3x^2|=|3x^2|=3x^2

User Amirkavyan
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