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Simplifying x2 + 15 = x2 + 2x + 1 Reorder the terms: 15 + x2 = x2 + 2x + 1 Reorder the terms: 15 + x2 = 1 + 2x + x2 Add '-1x2' to each side of the equation. 15 + x2 + -1x2 = 1 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 15 + 0 = 1 + 2x + x2 + -1x2 15 = 1 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 15 = 1 + 2x + 0 15 = 1 + 2x Solving 15 = 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. 15 + -2x = 1 + 2x + -2x Combine like terms: 2x + -2x = 0 15 + -2x = 1 + 0 15 + -2x = 1 Add '-15' to each side of the equation. 15 + -15 + -2x = 1 + -15 Combine like terms: 15 + -15 = 0 0 + -2x = 1 + -15 -2x = 1 + -15 Combine like terms: 1 + -15 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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