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Simplifying x2 + 16x + 81 = x2 + 18x + 81 Reorder the terms: 81 + 16x + x2 = x2 + 18x + 81 Reorder the terms: 81 + 16x + x2 = 81 + 18x + x2 Add '-81' to each side of the equation. 81 + 16x + -81 + x2 = 81 + 18x + -81 + x2 Reorder the terms: 81 + -81 + 16x + x2 = 81 + 18x + -81 + x2 Combine like terms: 81 + -81 = 0 0 + 16x + x2 = 81 + 18x + -81 + x2 16x + x2 = 81 + 18x + -81 + x2 Reorder the terms: 16x + x2 = 81 + -81 + 18x + x2 Combine like terms: 81 + -81 = 0 16x + x2 = 0 + 18x + x2 16x + x2 = 18x + x2 Add '-1x2' to each side of the equation. 16x + x2 + -1x2 = 18x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 16x + 0 = 18x + x2 + -1x2 16x = 18x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 16x = 18x + 0 16x = 18x Solving 16x = 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. 16x + -18x = 18x + -18x Combine like terms: 16x + -18x = -2x -2x = 18x + -18x Combine like terms: 18x + -18x = 0 -2x = 0 Divide each side by '-2'. x = 0 Simplifying x = 0
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