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Simplifying x2 + 81 = x2 + 2x + 2 Reorder the terms: 81 + x2 = x2 + 2x + 2 Reorder the terms: 81 + x2 = 2 + 2x + x2 Add '-1x2' to each side of the equation. 81 + x2 + -1x2 = 2 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 81 + 0 = 2 + 2x + x2 + -1x2 81 = 2 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 81 = 2 + 2x + 0 81 = 2 + 2x Solving 81 = 2 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 81 + -2x = 2 + 2x + -2x Combine like terms: 2x + -2x = 0 81 + -2x = 2 + 0 81 + -2x = 2 Add '-81' to each side of the equation. 81 + -81 + -2x = 2 + -81 Combine like terms: 81 + -81 = 0 0 + -2x = 2 + -81 -2x = 2 + -81 Combine like terms: 2 + -81 = -79 -2x = -79 Divide each side by '-2'. x = 39.5 Simplifying x = 39.5
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