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Simplifying x2 + 4 = 8 Reorder the terms: 4 + x2 = 8 Solving 4 + x2 = 8 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 + x2 = 8 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = 8 + -4 x2 = 8 + -4 Combine like terms: 8 + -4 = 4 x2 = 4 Simplifying x2 = 4 Take the square root of each side: x = {-2, 2}