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Simplifying (5x2 + -3x + 7) + (-5x2 + 3x + -7) = 0 Reorder the terms: (7 + -3x + 5x2) + (-5x2 + 3x + -7) = 0 Remove parenthesis around (7 + -3x + 5x2) 7 + -3x + 5x2 + (-5x2 + 3x + -7) = 0 Reorder the terms: 7 + -3x + 5x2 + (-7 + 3x + -5x2) = 0 Remove parenthesis around (-7 + 3x + -5x2) 7 + -3x + 5x2 + -7 + 3x + -5x2 = 0 Reorder the terms: 7 + -7 + -3x + 3x + 5x2 + -5x2 = 0 Combine like terms: 7 + -7 = 0 0 + -3x + 3x + 5x2 + -5x2 = 0 -3x + 3x + 5x2 + -5x2 = 0 Combine like terms: -3x + 3x = 0 0 + 5x2 + -5x2 = 0 5x2 + -5x2 = 0 Combine like terms: 5x2 + -5x2 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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