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Simplifying (x2 + 6x + -4) + (-1x2 + -6x + 4) = 0 Reorder the terms: (-4 + 6x + x2) + (-1x2 + -6x + 4) = 0 Remove parenthesis around (-4 + 6x + x2) -4 + 6x + x2 + (-1x2 + -6x + 4) = 0 Reorder the terms: -4 + 6x + x2 + (4 + -6x + -1x2) = 0 Remove parenthesis around (4 + -6x + -1x2) -4 + 6x + x2 + 4 + -6x + -1x2 = 0 Reorder the terms: -4 + 4 + 6x + -6x + x2 + -1x2 = 0 Combine like terms: -4 + 4 = 0 0 + 6x + -6x + x2 + -1x2 = 0 6x + -6x + x2 + -1x2 = 0 Combine like terms: 6x + -6x = 0 0 + x2 + -1x2 = 0 x2 + -1x2 = 0 Combine like terms: x2 + -1x2 = 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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