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Simplifying x + x2 + 4 = x2 Reorder the terms: 4 + x + x2 = x2 Add '-1x2' to each side of the equation. 4 + x + x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 4 + x + 0 = x2 + -1x2 4 + x = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 4 + x = 0 Solving 4 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4
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