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Simplifying 9 + x2 = x2 + 2x + 1 Reorder the terms: 9 + x2 = 1 + 2x + x2 Add '-1x2' to each side of the equation. 9 + x2 + -1x2 = 1 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 + 0 = 1 + 2x + x2 + -1x2 9 = 1 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 9 = 1 + 2x + 0 9 = 1 + 2x Solving 9 = 1 + 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. 9 + -2x = 1 + 2x + -2x Combine like terms: 2x + -2x = 0 9 + -2x = 1 + 0 9 + -2x = 1 Add '-9' to each side of the equation. 9 + -9 + -2x = 1 + -9 Combine like terms: 9 + -9 = 0 0 + -2x = 1 + -9 -2x = 1 + -9 Combine like terms: 1 + -9 = -8 -2x = -8 Divide each side by '-2'. x = 4 Simplifying x = 4
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