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Simplifying x2 + 4 = x2 + 4 Reorder the terms: 4 + x2 = x2 + 4 Reorder the terms: 4 + x2 = 4 + x2 Add '-4' to each side of the equation. 4 + -4 + x2 = 4 + -4 + x2 Combine like terms: 4 + -4 = 0 0 + x2 = 4 + -4 + x2 x2 = 4 + -4 + x2 Combine like terms: 4 + -4 = 0 x2 = 0 + x2 x2 = x2 Add '-1x2' to each side of the equation. x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 0 = x2 + -1x2 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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